If the total cost function for producing x lamps is

Question

C(x) = 90 + 36x + 0.1x^2
dollars, producing how many units will result in a minimum average cost per unit?
PLEASE EXPLAIN YOUR WORK
Thank you

Answer 1

avg cost is c(x)/x = .1x + 36 + 90/x

now just find x when dc/dx = 0.