Unformatted text preview: here are three main problems by percents:
Problem 1. Find an indicated percent of a given number.
The given number is multiplied by the indicated number of percents; then a product is divided
by 100. Example. A deposit in a bank has an annual increase 6%. A sum of money in the beginning was equal to
$10000. How many dollars will the sum be increased by in the end of the year? S o l u t i o n : $10000 · 6 / 100 = $600.
Example. Find a number by another given number and its percent value of the unknown number.
The given number is divided by its percent value; the result is multiplied by 100.
A salary by January was equal to $15000, that was equal 7.5% of an annual salary. What was
the annual salary ? S o l u t i o n: $15000 / 7.5 · 100 = $200000.
Example. Find the percent expression of one number by another.
The first number is divided by the second, and a result is multiplied by 100.
On 2001 a plant have produced 40000 cars; and on 2002 - only 36000 cars. What percent
Math I - 15 - Feel free to pass this on to your friends, but please don’t post it online.
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DLSUCET, PSHS-NCE, and other entrance tests. does it constitute relatively to the output of 2001 ?
S o l u t i o n: 36000 / 40000 · 100 = 90%. Ratio and proportion. Proportionality
Ratio is a quotient of dividing...
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- Spring '13
- Elementary arithmetic, college entrance exam