Question

A manufacturer produces bolts of fabric with a fixed width. The 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).
Given
f(17) = 8000
and
f '(17) = −340,
find
R'(17).

Answer 1

R'(p) = f(p) (because f(p)=q, we can treat it as a constant)

Thus R'(17) should be f(17) = 8000.

Answer 2

thanks

Answer 3

it said its wrong