B is what percentage of A
ФFormula for calculating what percentage of the number B from the number A.
If you know two number A and B and need find, B is what percentage of A, then
| P | = | B | · 100% |
| A |
For the derivation of this equation using the method of solving problems with percentage
| "All" | = | 100% | => | "Part in %" = | "Part" · "100%" |
| "Part" | "Part in %" | All |
Examples of solving problems: B is what percentage of A
Example 1.
5 is what percentage of 40.
Solution.
| 5 · 100% | = 12.5% |
| 40 |
Answer: 5 is 12.5% of 40.
Example 2.
In store book costs $ 400 and $ 380 on the market. Find what percentage of the market price in relation to the store?
Solution.
| 380 · 100% | = 95% |
| 400 |
Answer: 95%.
Example 3.
The bank deposit put $ 10,000 in a year have profited of $ 1200, what the interest rate was in the bank.
Solution. The interest rate is equal to a percentage, which is the profit of the deposit amount
| 1200 · 100% | = 12% |
| 10 000 |
Answer: the interest rate was 12%.
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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