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On the math pretest Myrna got 6 correct. On the postest she got 21 correct. What is the percent of increase?

Sagot :

In this problem

6 represent the 100% percentage

Find out the difference (21-6=15)

so

Applying proportion

Find out the percent of increase for the difference of 15

100/6=x/15

solve for x

x=((100/6)*15

x=250%

the answer is 250%

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