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20 August, 15:50

Cookies are on sale! Today each cookie costs $ 0. 7 5 $0.75 less than the normal price. Right now if you buy 7 7 of them it will only cost you $ 2. 8 0 $2.80! Write an equation to determine the normal price of each cookie (c) (c). Find the normal price of each cookie.

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  1. 20 August, 16:01
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    Hence, the normal price of each cookie = $ 1.15.

    Step-by-step explanation:

    Cookies are on sale!

    Today each cookie costs $0.75 less than the normal price.

    So let c be the normal price of one cookie.

    Hence, today 1 cookie will cost = $ (c-0.75)

    Right now if you buy 7 of them it will only cost you $2.80!

    Hence,

    cost of 7 cookie = 7 * (c-0.75)

    This means that:

    7 * (c-0.75) = 2.80

    i. e. 7c-7*0.75=2.80

    ⇒ 7c-5.25=2.80

    ⇒ 7c=0.80+5.25

    ⇒ 7c=8.05

    dividing both side by 7 we get:

    c=1.15

    Hence, the normal price of each cookie = $ 1.15.
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