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    Prplepnutbuter's Avatar
    Prplepnutbuter Posts: 1, Reputation: 1
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    #1

    Nov 10, 2010, 04:38 PM
    Quadradic equation word problem?
    A sports store sells about 50 mountainbikes per month at a price of $220 each. For each $20 decrease in price, about 10 more bikes per month are sold.

    Write a quadratic function in standard form that models the revenue from bike sales.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 10, 2010, 11:43 PM

    50 bikes sold for $220 each yields a revenue of $11000

    If you decrease by $20, the amount of sales becomes 60. And the new revenue becomes (200 x 60) = $12000

    So, the revenue at any time is given by:



    Where x is the number of $20 reduction in price.
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