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8 October, 19:24

Compare the number of friends at the beginning of a month and at the end of that month, if it decreased by 60% and then increased by 80%

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  1. 8 October, 21:17
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    28% decrease

    Step-by-step explanation:

    Let X be the no. of friends in the beginning

    60% decrease = 40% left

    0.4X

    80% increase = 180% of previous

    1.8 (0.4X) = 0.72X

    72% of X

    100 - 72 = 28

    28% decrease
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