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26 July, 16:58

A store marks up some shoes 60% to $128. What did they cost before the mark up?

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  1. 26 July, 19:17
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    Answer:$320

    Step-by-step explanation:

    60 = (a-128) / a x 100

    60=100 (a-128) / a

    Cross multiplying we get

    60a=100 (a-128)

    60a=100a-12800

    Collect like terms

    12800=100a-60a

    12800=40a

    Divide both sides by 40

    12800/40=40a/40

    320=a

    a=320
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