Percentage Calculation Table: Formula and 10 Solved Problems

There is a confusion Percentage Calculation Table on internet. Therefore, in this post we will cover all that important stuff regarding Percentage.

We have covered Different Percentage Tables, Chart and Tools. Also we have covered some solved example regarding it that we often get in exams.

We will cover it from the basics to advanced. Make sure you read and understand the each till the very end.

Percentage and Formula

In math, a percentage is just a fancy way of expressing a part of a whole, where the whole is represented by the number 100. The word “percent” literally means “per hundred.” It’s a way of comparing a part to the whole on a scale of 100.

When you want to find a percentage of a number, you follow these steps:

• Divide by the Whole:
  • Take the part you’re interested in (let’s call it the “part”).
  • Divide it by the whole or the total (let’s call it the “whole”).
• Multiply by 100:
  • Multiply the result from step 1 by 100.

Formula:

$\text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100$

How To Calculate Percentage Of Marks: Any Number Of Subjects

Percentage Calculation Table

Here are three types of percentage calculation table that help you find percentage values, increment and decrement of percentage and reverse percentage.

Finding a Percentage of a Value

Original Value	Percentage	Result
150	25%	37.5
250	8%	20
300	50%	150
120	15%	18
180	30%	54
Formula	$\(\text{Original} \times \frac{\text{Percentage}}{100}\)$

In this table, you have an “Original Value” and a “Percentage.” The “Result” column shows the calculated value when you find a percentage of the original value using the provided formula.

Let’s take the first row as an example:

• Original Value: 150
• Percentage: 25%

Now, apply the formula:

$\text{Result} = \text{Original} \times \left(\frac{\text{Percentage}}{100}\right)$

For the first row:

$\text{Result} = 150 \times \left(\frac{25}{100}\right) = 150 \times 0.25 = 37.5$

So, the result for the first row is (37.5).

You can follow the same process for each row in the table to find the percentage of the original value and calculate the result.

The formula helps you determine what portion of the original value the specified percentage represents.

Finding the Percentage Increase or Decrease

Initial Value	Final Value	Percentage Change
100	120	20% Increase
200	150	25% Decrease
80	100	25% Increase
300	240	20% Decrease
150	180	20% Increase
Formula	$\(\frac{{\text{Final} – \text{Initial}}}{{\text{Initial}}} \times 100\)$

Certainly! Let’s discuss the concept of compound interest using a simple example.

Example:

Suppose you invest 1,000 in a savings account that offers an annual interest rate of 5%. The interest is compounded annually, meaning that interest is added to the principal at the end of each compounding period.

Formula:

The formula for compound interest is given by the following formula:

$A = P \left(1 + \frac{r}{n}\right)^{nt}$

Where:

• ( A ) is the future value of the investment/loan, including interest.
• ( P ) is the principal amount (the initial amount of money).
• ( r ) is the annual interest rate (as a decimal).
• ( n ) is the number of times that interest is compounded per unit ( t ) (time).
• ( t ) is the time the money is invested/borrowed for, in years.

Now, let’s apply this formula to the example:

Given:

• Principal amount (( P )): 1,000
• Annual interest rate (( r )): 5% or 0.05 (as a decimal)
• Number of times compounded per year (( n )): 1 (compounded annually)
• Time (( t )): 3 years

Plug the values into the formula:

A = 1000 $\left(1 + \frac{0.05}{1}\right)^{1 \times 3}$

Calculate:

$A = 1000 \times (1.05)^3$

Again $A = 1000 \times 1.157625$

Now; $A \approx 1157.63$

So, after 3 years, the future value of the investment will be approximately $1157.63. The interest earned is $1157.63 – $1000 = $157.63.

Calculating Reverse Percentage

Original Value	New Value	Percentage Change
80	100	25% Increase
150	120	20% Decrease
200	250	25% Increase
120	100	16.67% Decrease
250	200	20% Decrease
Formula	$\(\left(\frac{{\text{New} – \text{Original}}}{{\text{Original}}}\right) \times 100\)$

Suppose you have a product that was initially priced at Rs. 80, and it undergoes a 20% price increase. The goal is to find the original price before the increase.

Formula:

The formula for calculating the original value before a percentage change is:

$\text{Original Value} = \frac{\text{New Value}}{1 + \left(\frac{\text{Percentage Change}}{100}\right)}$

Given:

• New Value: Rs. 80 (after the 20% increase)

Plug the values into the formula:

Original Value=801+(20/100)Original Value=1+(20/100)80​

Calculate:

$\text{Original Value} = \frac{80}{1 + \left(\frac{20}{100}\right)}$

$\text{Original Value} = \frac{80}{1.20} \approx 66.67$

So, the original price of the product before the 20% increase was approximately $66.67.

This formula is useful when you know the final value after a percentage change and want to find the original value.

It involves dividing the new value by a factor that accounts for the percentage change. In this example, dividing by 1.201.20 adjusts for the 20% increase.

Percentage Chart Table

S.no	Ratio	Fraction	Percent(%)	Decimal
1	1:1	1/1	100	1
2	1:2	1/2	50	0.5
3	1:3	1/3	33.333	0.3333
4	1:4	1/4	25	0.25
5	1:5	1/5	20	0.20
6	1:6	1/6	16.667	0.16667
7	1:7	1/7	14.285	0.14285
8	1:8	1/8	12.5	0.125
9	1:9	1/9	11.111	0.11111
10	1:10	1/10	10	0.10
11	1:11	1/11	9.0909	0.0909
12	1:12	1/12	8.333	0.08333
13	1:13	1/13	7.692	0.07692
14	1:14	1/14	7.142	0.07142
15	1:15	1/15	6.66	0.0666

10 Computing a Percentage From a Table of Values

Here 20 question based on Percentage Calculation Table Of Values with there step by step solution

Percentage Calculation Table Of Values Question 1:

Q: In a class of seventh graders, students were asked to choose between playing soccer and tennis as their favorite sport. The results are tabulated below. Find the percentage of students whose favorite sport is soccer?

	Soccer	Tennis
Boys	18	12
Girls	10	15

Step-by-Step Answer:

Calculate the total number of students who like soccer
=18 (boys) + 10 (girls) = 28 students

Calculate the total number of students:
=18+12+10+15+18+12+10+15
=110 students

Calculate the percentage of students who like soccer:

$(\frac{\text{Total soccer players}}{\text{Total students}} \times 100)$

$\frac{28}{110} \times 100 $

$\frac{28}{110} \times 100 \approx 25.4545\%$

So, $(\frac{28}{110} \times 100)$ is approximately $(25.45\%)$.

Percentage Calculation Table Of Values Question 2:

Q: In a survey of eighth graders, students were asked to choose their preferred activity, either painting or sculpting. The results are tabulated below. Determine the percentage of students who enjoy sculpting?

	Painting	Sculpting
Boys	15	10
Girls	8	12

Step-by-Step Answer:

Calculate the total number of students who like sculpting:
$10 \, (\text{boys}) + 12 \, (\text{girls}) = 22$

Calculate the total number of students:
$15 \, (\text{boys}) + 10 \, (\text{boys painting}) + 8 \, (\text{girls}) + 12 \, (\text{girls sculpting}) = 45$

Calculate the percentage of students who like sculpting:
$\frac{\text{Total students who like sculpting}}{\text{Total students}} \times 100 = \frac{22}{45} \times 100 \approx 48.89\%$

Therefore, the percentage of students who like sculpting is approximately $(48.89\%)$.

Percentage Calculation Table Of Values Question 3:

Q:Among sixth graders, students were asked to choose between science and art as their favorite subject. The results are tabulated below. Find the percentage of students whose favorite subject is science?

	Science	Art
Boys	12	8
Girls	15	10

Step-by-Step Answer:

Calculate the total number of students who like science:
$12 \, (\text{boys}) + 15 \, (\text{girls}) = 27$

Calculate the total number of students:
$12 \, (\text{boys}) + 8 \, (\text{boys art}) + 15 \, (\text{girls}) + 10 \, (\text{girls art}) = 45$

Calculate the percentage of students who like science:
$\frac{\text{Total students who like science}}{\text{Total students}} \times 100 = \frac{27}{45} \times 100 \approx 60\%$

Therefore, the percentage of students who like science is approximately $(60\%)$.

Percentage Calculation Table Of Values Question 4:

Q: In a class of fifth graders, students were asked to choose between music and dance as their favorite extracurricular activity. The results are tabulated below. Determine the percentage of students whose favorite activity is dance?

	Music	Dance
Boys	10	15
Girls	12	8

Step-by-Step Answer:

Calculate the total number of students who like dance:
$15 \, (\text{boys}) + 8 \, (\text{girls}) = 23$

Calculate the total number of students:
$10 \, (\text{boys}) + 15 \, (\text{boys dance}) + 12 \, (\text{girls}) + 8 \, (\text{girls dance}) = 45$

Calculate the percentage of students who like dance:
$\frac{\text{Total students who like dance}}{\text{Total students}} \times 100 = \frac{23}{45} \times 100 \approx 51.11\%$

Therefore, the percentage of students who like dance is approximately $(51.11\%)$

Percentage Calculation Table Of Values Question 5:

Q: Among ninth graders, students were surveyed on their preference for reading or watching movies. The results are tabulated below. Find the percentage of students who prefer reading?

	Reading	Movies
Boys	20	15
Girls	18	12

Step-by-Step Answer:

Calculate the total number of students who like reading:
$20 \, (\text{boys}) + 18 \, (\text{girls}) = 38$

Calculate the total number of students:
$20 \, (\text{boys}) + 15 \, (\text{boys movies}) + 18 \, (\text{girls}) + 12 \, (\text{girls movies}) = 65$

Calculate the percentage of students who like reading:
$\frac{\text{Total students who like reading}}{\text{Total students}} \times 100 = \frac{38}{65} \times 100 \approx 58.46\%$

Therefore, the percentage of students who like reading is approximately $(58.46\%)$.

Percentage Calculation Table Of Values Question 6:

Q: In a survey conducted at a company picnic, employees were asked to choose between playing volleyball and badminton. The results are tabulated below. Find the percentage of employees whose favorite sport is volleyball?

	Volleyball	Badminton
Executives	10	5
Administrative Staff	8	12

Step-by-Step Answer:

1. Calculate the total number of employees who like volleyball:
   $10 \, (\text{executives}) + 8 \, (\text{administrative staff}) = 18$
2. Calculate the total number of employees:
   $10 \, (\text{executives}) + 5 \, (\text{executives badminton}) + 8 \, (\text{administrative staff}) + 12 \, (\text{administrative staff badminton}) = 35$
3. Calculate the percentage of employees who like volleyball:
   $\frac{\text{Total employees who like volleyball}}{\text{Total employees}} \times 100 = \frac{18}{35} \times 100 \approx 51.43\%$

Therefore, the percentage of employees who like volleyball is approximately $(51.43\%)$.

Percentage Calculation Table Of Values Question 7:

Q: In a neighborhood survey, residents were asked to choose between gardening and hiking as their preferred outdoor activity. The results are tabulated below. Determine the percentage of residents whose favorite activity is hiking?

	Gardening	Hiking
Young Professionals	15	10
Retirees	5	8

Step-by-Step Answer:

Calculate the total number of residents who like hiking:
$10 \, (\text{young professionals}) + 8 \, (\text{retirees}) = 18$

Calculate the total number of residents:
$15 \, (\text{young professionals}) + 10 \, (\text{young professionals hiking}) + 5 \, (\text{retirees}) + 8 \, (\text{retirees hiking}) = 38$

Calculate the percentage of residents who like hiking:
$\frac{\text{Total residents who like hiking}}{\text{Total residents}} \times 100 = \frac{18}{38} \times 100 \approx 47.37\%$

Therefore, the percentage of residents who like hiking is approximately $(47.37\%)$.

Percentage Calculation Table Of Values Question 8:

Q: In a technology survey, participants were asked to choose between using smartphones and laptops. The results are tabulated below. Determine the percentage of participants whose favorite device is a laptop?

	Smartphones	Laptops
Students	18	12
Professionals	15	20

Step-by-Step Answer:

Calculate the total number of participants:
$18 \text{(students)} + 12 \text{(students laptops)} + 15 \text{(professionals)} + 20 \text{(professionals laptops)}$.

Calculate the percentage of participants who like laptops.

$\text{Total Participants Liking Laptops} = 12 (\text{students}) + 20 (\text{professionals}) = 32$

$\text{Total Participants} = 18 (\text{students}) + 12 (\text{students laptops}) + 15 (\text{professionals}) + 20 (\text{professionals laptops}) = 65$

$\text{Percentage of Participants Liking Laptops} = \left( \frac{32}{65} \right) \times 100$

$\text{Percentage of Participants Liking Laptops} \approx 49.23\%$

Therefore, approximately 49.23% of the participants prefer laptops.

Percentage Calculation Table Of Values Question 9:

Q: In a survey of weekend activities, individuals were asked to choose between going to the movies and attending concerts. The results are tabulated below. Determine the percentage of individuals whose favorite weekend activity is attending concerts?

	Movies	Concerts
Teenagers	12	8
Adults	15	20

Step-by-Step Answer:

Calculate the percentage of individuals who like attending concerts.

Now, let’s proceed with the calculations:

$\text{Total Individuals Liking Concerts} = 8 (\text{teenagers}) + 20 (\text{adults}) = 28$

$\text{Total Individuals} = 12 (\text{teenagers}) + 8 (\text{teenagers concerts}) + 15 (\text{adults}) + 20 (\text{adults concerts}= 55$

$\text{Percentage of Individuals Liking Concerts} = \left( \frac{28}{55} \right) \times 100 $

$\text{Percentage of Individuals Liking Concerts} \approx 50.91\% $

Therefore, approximately 50.91% of the individuals prefer attending concerts.

Percentage Calculation Table Of Values Question 10:

Q: In a study of leisure activities, participants were asked to choose between reading books and watching TV. The results are tabulated below. Find the percentage of participants whose favorite activity is reading books?

	Reading Books	Watching TV
College Students	18	12
Working Adults	10	15

Certainly! Let’s complete the step-by-step answer:

Step-by-Step Answer (Continued):

Calculate the percentage of participants who like reading books.

Now, let’s proceed with the calculations:

$\text{Total Participants Liking Reading Books} = 18 (\text{college students}) + 10 (\text{working adults}) = 28$

$\text{Total Participants} = 18 (\text{college students}) + 12 (\text{college students watching TV}) + 10 (\text{working adults}) + 15 (\text{working adults watching TV}) = 55$

$\text{Percentage of Participants Liking Reading Books} = \left( \frac{28}{55} \right) \times 100$

$\text{Percentage of Participants Liking Reading Books} \approx 50.91\%$

Therefore, approximately 50.91% of the participants prefer reading books.

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