13. [-/6.66 Points] DETAILS TANAPCALC9 2.3.017. A manufacturer has a monthly fixed cost of $28,500 and a production cost of $8 for each unit produced. The product sells for $11/unit. (a) What is the cost function? C(X) = (b) What is the revenue function? R(X) = (c) What is the profit function? P(x) = (d) Compute the profit (loss) corresponding to production levels of 8,000 and 11,000 units. P(8,000) : P(11,000) =