math

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a pari of shoes is on sale for 10% off the original price. If the sale price is $14.40, what was the original price of the item?

  • math -

    0.9x = 14.4
    x = ?

  • math -

    x = 16

  • math -

    .9 derives from the fact that you're paying 90/100 or 90% of the original price.

    it's basically cross multiply. you want to find the original price (100). thus, the x in the denominator is across the 100

    90/100=14.40/x
    90x=1440
    numerator of the left side multiply to the denominator of the right
    =numerator of the right side multiply to the denominator of the left

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