A piano manufacturer has a daily fixed cost of $1,800 and a marginal cost of $2,000 per piano. Find the cost  C(x)  of manufacturing x pianos in one day. C(x) =        Use your function to answer the following questions. (a) On a given day, what is the cost of manufacturing three pianos? $  (b) What is the cost of manufacturing the third piano that day? $  (c) What is the cost of manufacturing the 11th piano that day? $  (d) What is the variable cost? $       What is the fixed cost? $  What is the marginal cost? $  per piano

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