A company produces very unusual CD's for which the variable cost is $18 per CD and the fixed costs are $20,000. Assume that they will sell all the CD's they can produce, and their selling price is $87 each. Let x be the number of CD's produced. Write the total cost C as a function of the number of CD's produced. C(x) = 20,000 + 18x Write the total revenue R as a function of the number of CD's produced. R(x): = 87x Write the total profit P as a function of the number of CD's produced. P(x) = 69x - 20,000 Write the marginal profit M as a function of the number of CD's produced. M(x) = = Write the profit margin f as a function of the number of CD's produced. f(x) =

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