McGraw Hill Integrated II, 2012
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Exercise 2 Page 713

492.17

Practice makes perfect
In the percent proportion, the ratio of the part a to the whole b is equal to the percent p written as a fraction. a/b=p/100 Given any two of these three variables, we can find the third one. In this exercise, we want to find 79 % of 623. Therefore, we have that p= 79 and b= 623.
a/b=p/100
a/623=79/100
a=79/100* 623
Evaluate right-hand side
a=79* 623/100
a=49 217/100
a=492.17
This means that 492.17 is 79 % of 623.