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How do you go about to solve this question?

31. Average profit. The total profit (in tens of dollars) from selling x self-help books is:

P(x)= 5x-6/2x-3

Find the average profit from each sales level:

(a) 8 books, (d) Find marginal average profit function.

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(a) The average profit is P(x)/x; just plug in x=8 in that expression.

(b) Marginal anything is the derivative of that anything; the marginal average profit is the derivative of P(x)/x; differentiate P(x)/x to get it.

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HOW DO WE SOLVE QUE.8 IN FINAL EXAMS APRIL 14 2001.

THANKS

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Solved; take a look at the surounding posts (and in particular at the topics called Practice Final.)