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$.
Percent
Percent Definition. Main information
Decimal to Percent. Percent to Decimal
The method of solving problems with percentage
The most common types of problems with percent:
Find P percent of A
B is P percent of what?
B is what percent of A?
Find the number which is greater (less) than a given number by P percent
Find the number A if known number B which greater (less) than A by P percent
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