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10 December, 20:17

Sherry purchased a new backpack for her daughter. The backpack was on sale for 20% off the regular price. If Sherry paid $28.80 for the backpack without sales tax, what was the original price?

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  1. 10 December, 23:48
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    28.80 +.20X = X

    .20X = X - 28.80

    1/5 =.20

    X/5 = X - 28.80

    X = 5X - 144

    Set the new X equal to the original X

    28.80 +.20X = 5X - 144

    172.8 +.20X = 5X

    172.8 = 4.8X

    36 = X

    36$ is the original price

    To check,

    28.80 + (.20 x 36) = 36

    28.80 + 7.2 = 36

    36 = 36
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