Finite Math

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65, A drugstore sells a drug costing $85 for $112 and drug costing $175 for $238.
A, If the markup policy of the drugstore is assumed to be linear, write an equation that expresses retail price R in terms of cost C (wholesale price).
B, what does a store pay (to the nearest dollar) for a drug that retails for $185?

  • Finite Math -

    Assume the linear relationship
    R = mC + b
    where m and b are constants

    112 = 85 m + b
    238 = 175 m + b
    126 = 90m
    m = 1.40
    b = -7
    R = 1.40 C - 7

    This is a linear relationship, but it means they will be selling under C < $5 drugs at a loss, or paying people to take them. This is unrealistic.

    If R = 185, C = $137.14

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