Calculus

It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 5% per year. If the current demand is increasing by 4000 units per year and if the price remains fixed at $850 per unit, how much revenue will the manufacturer receive from the sale of the product over the next 5 years?

Any help would be great, the book doesn't give any examples of this type of problem.

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asked by Alex
  1. dn/dt = .05 n
    dn/n = . 05 dt
    ln n = .05 t + k

    n = e^(.05 t+k) = e^k * e^.05 t = C e^.05 t

    dn/dt = C(.05) e^.05t
    when t = 0 dn/dt = 4000
    so
    4000 = .05 C (1)
    C = 80,000
    so
    n = 80,000 e^.05 t
    at t = 5, n = 80,000 e^.25
    or
    n = 102,722 units
    102722 * 850 = 87,313,728.33

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    posted by Damon

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