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Definition. Percentage is onehundredth part of the number. It is often denoted using the percent sign, "%".
Decimal to Percent. Percent to Decimal
Definition. Compound interest is the effect often encountered in economics and finance, when the interest income at the end of each period are added to the principal amount and the obtained value in the future becomes a starting point for the calculation of new interest.The most common types of problems with percent
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. The formulas for the solution of problems with percent
Examples of solving problems with percentExample 1. Find number B which is equal to 5% of 20.Solution.
Example 2. 35 is what percent of 20.Solution.
Example 3. Find the number which is less than 20 by 15%.Solution.
Example 4. Find profits from the $ 30,000 deposit for 3 years at 10% per annum, if at the end of each year interest is added to your deposit.Solution. We use the formula for the calculation of compound interest:
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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