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When buying Brilliant T-shirts, Bradan determines that the total cost of buying N shirts is given by the function
If he wants to minimize the total cost of buying shirts, how many shirts should he buy?

  • maths -

    I will assume you meant:
    C(n) = .04n^2 - 36n + 9000
    C ' (n) = .08n - 36
    = 0 for a min of C
    .08n = 36
    n = 450

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