9. Sales. Let N (x) be the number of computers sold annually when the price is x dollars per computer. Explain in words what occurs if N( 1000) = 500,000 and N'(1000) 2 100. For Exercises 1116, assume that C (x) and R(x) are in dollars and x is the number of units produced and sold. 11. For the totalcost function C(x) = 0.013.:2 + 0.6x + 30, find 5C and C(x) When at = 70 and Ax = 1