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Solution for 'What is 15% of 20?'
In the following example consider that:
- The percentage figure is represented by X%
- The whole amount is represented by W
- The portion amount or part is represented by P
Solution Steps
The following question is of the type "How much X percent of W", where W is the whole amount and X is the percentage figure or rate".
Let's say that you need to find 15 percent of 20. What are the steps?
Step 1: first determine the value of the whole amount. We assume that the whole amount is 20.
Step 2: determine the percentage, which is 15.
Step 3: Convert the percentage 15% to its decimal form by dividing 15 into 100 to get the decimal number 0.15:
15100 = 0.15
Notice that dividing into 100 is the same as moving the decimal point two places to the left.
15.0 → 1.50 → 0.15
Step 4: Finally, find the portion by multiplying the decimal form, found in the previous step, by the whole amount:
0.15 x 20 = 3 (answer).
The steps above are expressed by the formula:
P = W × X%100
This formula says that:
"To find the portion or the part from the whole amount, multiply the whole by the percentage, then divide the result by 100".
The symbol % means the percentage expressed in a fraction or multiple of one hundred.
Replacing these values in the formula, we get:
P = 20 × 15100 = 20 × 0.15 = 3 (answer)
Therefore, the answer is 3 is 15 percent of 20.