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8 March, 10:14

David purchased some cookies at the cost of 5 for $4 and sold them at 4 for $5. David made a profit of $180 in total. How many cookies did David purchase to make that much money?

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  1. 8 March, 11:45
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    David purchased some cookies at the cost of

    5 for $4 (5/4=1.25) and

    sold them at 4 for $5 (4/5=0.80).

    To find cost per cookie subtract 1.25-0.80=0.45

    David made a profit of $180 in total (divide profit per cookie cost: 180/0.45 = 400)

    How many cookies did David purchase to make that much money?

    He needed to make 400 cookie to make the profit of $180.
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