Suppose that the cost function C(x) (in dollars) for the company in Problem is
C(x)= 830 + 396x

(A) Write an equation for the profit P(x).
(B) Graph the profit function P.

Problem
The marketing research department for a computer company used a large city to test market the firm s new laptop. The department found that the relationship between price p (dollars per unit) and demand x (units sold per week) was given approximately by

p= 1,296 - 0.12x² 0<=x<=80

So, weekly revenue can be approximated by

R(x)= xp = 1,296x - 0.12x³ 0<=x<=80

Graph the revenue function R.