In 6th grade Lilly read 15 books. This year in 7th grade she rad 18 books. What is the percent of increase in the number books that Lilly re

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In 6th grade Lilly read 15 books. This year in 7th grade she rad 18 books. What is the percent of increase in the number books that Lilly read this year?

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    2021-11-15T14:08:24+00:00

    Answer: 20%

    Step-by-step explanation:

    To solve this problem you must apply the proccedure shown below:

    1. You must apply the following formula (Let’s call the percent of increase:x):

    x=(\frac{increase}{original})(100)

    increase=18-15\\original=15

    2. Substitute values and solve:

    x=(\frac{18-15}{15})(100)\\

    x=20%

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