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8 December, 08:12

A publishing company sells 100,000 copies of certain books each year. It costs the company $1 to store each book for a year. Each time it must print additional copies, it costs the company $500 to set up the presses. How many books should the company produce during each printing in order to minimize its total storage and setup costs?

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  1. 8 December, 10:45
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    10,000 books

    Step-by-step explanation:

    Let x be the number of print runs per year and let y the number of books per print run.

    Thus, xy = 100,000.

    Now from the question, we only start a new print run when we have sold all books in the storage. Thus;

    Per print run we now have a cost of;

    (x * 1) / (y * 2)

    This is because right after the print run, we have y books that last 1/n years (until the next print run). Now, if we plot number of books in storage vs time, we will see a sawtooth pattern where the spikes begin at each print run and will linearly decrease to 0 until the next sprint run which implies constant demand. The area of each triangle will be how many book⋅years we have to pay the storage for. This area is;

    (y * (1/x)) / 2

    We'll have to multiply this number by 1 so we can then we get the storage cost per printrun:

    (y * (1/x)) / 2 * 1 = y/2x

    Since we do x print runs, the total storage costs is; y/2x * x = y/2

    The total print run cost is (500 * x). Therefore, the total cost is;

    C_total = (500x) + (y/2)

    From initially, we saw that;

    xy = 100000

    So, x = 100,000/y

    C_total = (500*100,000/y) + (y/2)

    C_total = 50000000/y + y/2

    To minimize its total storage and setup costs, we will find the derivative of the total cost and equate to zero.

    So;

    dC/dx = - 50000000/y² + 1/2

    At dC/dx = 0, we have;

    0 = - 50000000/y² + 1/2

    50000000/y² = 1/2

    2 * 50000000 = y²

    y = √2 * 50000000

    y = 10,000 books
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