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8 November, 06:39

Jacqueline owns a chain of fashion stores. She had 200 stores in 2010. Her goal is to increase the number of stores she owns at a rate of 20 percent every year.

If she sticks to her goal, in 2018 she will have approximately__stores.

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  1. 8 November, 10:28
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    Answer: 86

    Explanation:

    This is a geometric series. This is, each year the number of stores is equal to the number of a store times a factor. And the factor is the same every year.

    That lets you state this formula:

    Number of stores year n = (number of stores year 1) * (factor) ⁿ

    The year 1 is 2010.

    The number of stores year 1 is 200 (given).

    The factor is 1 + 20% = 1 + 0.20 = 1.20

    In 2018, n = 2018 - 2010 = 8.

    So, you can subsitute all the values in the formula:

    Number of stores year 8 = 200 (1,20) ⁸ ≈ 85.99 ≈ 86
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