Calculus

At the moment OHaganBooks is selling 1000 books per week and its sales are rising at a rate of 200 books per week. Also, it is now selling all its books for $20 each, but the price is dropping at a rate of $1 per week. I need to know at what rate OHaganBooks' revenue is rising or falling given these conditions. I would also like to see the company's revenue increase at a rate of $5000 per week. At what rate would sales have to have been increasing to accomplish this?

Can somebody help me answer this and explain the steps to solve the problem?

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  1. write the functions.

    revenue= number books sold * price book

    dRev/dt=n dp/dt + p dn/dt

    you are given n, p and dp/dt, and dn/dt

    calculate.
    For the second part, set dRev/dt to 5000
    find dn/dt given n, p, dp/dt

    I will be happy to critique your work.

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    bobpursley
  2. ok i got this
    R=(1000+200x)(20-x)
    R'=3000-400x
    is that right so far?

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  3. and x=weeks?

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