Calculus

The manager of a large apartment complex knows from experience that 80 units will be occupied if the rent is 460 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 10 dollar increase in rent. Similarly, one additional unit will be occupied for each 10 dollar decrease in rent. What rent should the manager charge to maximize revenue?

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  1. let the number of $10 increases be n

    new rent = 460+10n
    number rented= 80-n

    Revenue = (80-n)(460+10n)
    = 36800 + 340n - 10n^2

    d(Rev)/dn = 340 - 20n
    = 0 for a max/min
    20n=340
    n = 17

    So there should be an increase of 17(10) or 170
    and the new rent should be 630
    and 63 units would be rented

    check:
    let n = 16
    rent = 620
    units rented = 64
    Rev = 620(64) = 39680

    let n = 17
    rent = 630
    units rented = 63
    Rev = 39690 , a bit more , our maximum

    let n = 18
    rent = 640
    units rented = 62
    Rev = 39680 , not as much as the 39690 at n = 17

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