Calculus- Revenue question?

Question

A manufacturer produces bolts of a fabric with a fixed width. A quantity q of this fabric (measured in yards) that is sold is a function of the selling price p (in dollars per yard), so we can write q=f(p). Then, the total revenue earned with selling price p is R(p)=pf(p).

Find R′(20), given f(20)=10000, and f′(20)=−350. (What does this mean?)

Answer 1

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R'=1.85

f'=24.1