
The method of solving problems with percentageAll ratios and formulas for solving problems with percent, are derived from the proportion. Data of the tasks with percents can be written as the following relations:
which can be written as a proportion
Using this proportion, you can get a formulas for the solution of basic types problems with percent. Examples of task with percentExample 1. Find 15% of 30.
Solution.
write proportion
solve the equation
Example 2. 35 is what percent of 20?
Solution.
write proportion
solve the equation
Example 3. 20 is 5% of what?
Solution.
write proportion
solve the equation
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.
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