The company Shirts Galore has figured its total cost of producing and selling x units of T-shirts per month is given by the equation C(x) = 120 + 2.5x - 0.0002x. a. Write a rational function to represent the average cost of producing and selling a shirt. [A1] b. If the production level is 1200 shirts per month, find the average cost of producing and selling a shirt. [A1] c. If the shirts are sold for $7.98 a shirt, what is the profit realized on producing and selling 1200 shirts per month? [A1] d. What price must be charged when selling the shirts for a profit of $7368 to be made on 1200 shirts in one month? [A1]