### The Zinger Company: Total Cost, Marginal Revenue and Price

Zinger Company makes and sells a sewing machine line. manufactures and sells a line of sewing machines. Demand (Q) is represented by the equation below: Q = 400 - .5P P = price. The total cost of making Q units/period are represented by: TC = 20,000 + 50Q + 3Q2. What is the expression for total profits in term