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Find P percent of A

Formula for calculating P percent of number A.

B = A · P
100%

For the derivation of this equation using the method of solving problems with percentage

"All" = 100%   =>   "Part" = "All" · "Part in %"
"Part""Part in %"100%

Examples of solving problems: percent from given number

Example 1.
What is 5% of 40.

Solution:

5% · 40 = 2
100%

Answer: 5% of 40 is 2.



Example 2.
In a class is 30 students 10% of them is girls. How many girls in the class?

Solution.

The number of girls = 30 · 10% = 3
100%

Answer: in class is 3 girls.



Example 3.
Dad put a deposit 400,000$ at 12% per annum. How much profit will receive a family in a year?

Solution.

profit = 400 000 · 12% = 48 000
100%

Answer: profit is 48,000$.

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