This calculator will help you solve X percent of what number is Y. Enter the percent in the first input box and Y in the second box and press calculate. The calculator will display a step by step tutorial on how to arrive on the answer.

What is percentage?

Before you learn how to find Percent of what number is Y, you need to know what percentage is. It refers to the representation of a number as a ratio of 100. Percent is derived from the word per 100.

How to solve X percent of what number is Y

Follow the examples below to find out how you can solve X percent of what number is Y.

Example 1: 50 percent of what number is 20

We know the percentage and the answer but not the number.

Step 1: Write the problem as an expression

50/100 x X = 20

Step 2: Simplify the expression

X= 20 x 100/50

Step 3: 2000/50

=40

Therefore 50 percent of 40 is 20

Example 2: 70 percent of what number is 10

Step 1: Write the problem as an expression

70/100 x X =10

Step 2: Simplify the expression

X= 10 x 100/70

Step 3: 1000/70

X= 14. 29

Therefore 70 percent of 14.29 is 10

Example 3: 42 percent of what number 90

Step 1: Write the problem as an expression

42/100 x X = 90

Step 2: Simplify the expression

X= 90 x 100/42

Step 3: 9000/42

=214.29

Therefore 42 percent of 214.29 is 90

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