Problema Solution
A revenue R received for selling x stereos is given by the formula R=-1/5x^2+80x-1000. How many stereos must be sold to obtain the maximum revenue? What is the maximum revenue?
Answer provided by our tutors
R=-1/5x^2+80x-1000 by differentiate w.r.t x
dR/dx=-2/5x+80
for max. revenue dR/dx = 0, then
-2/5x+80=0
x=200