Question

A company manufacturers and sells x electric drills per month. The monthly cost and price-demand equations are
C(x)=64000+60x, p=190−x/30, 0≤x≤5000.

a) production level at max revenue = 2850
b) price to max profit = $125
c) Suppose that a 5 dollar per drill tax is imposed. Determine the number of drills that should be produced and sold in order to maximize profit under these new circumstances. ???

Answer 1

A.
Revenue x * p = 220x - x^2/30

d/dx = 220 * 15 = 3300

B.
Profit = Revenue - Cost

= 220x - x^2/30 - 72000 - 80x

d/dx = 220 - x/15 - 80 = 0

x = 15 * 140 = 2100

p = 220 - 2100/30 = 220 - 70 = $150

C.
With $5 tax the price-demand equation should be

p = 220 - x/30 + 5

Profit = 225x - x^2/30 - 72000 - 80x

d/dx = 225 - x/15 - 80 = 0

x = 15 * 145 = 2175