Calculate total profit at this output. Solution: ( TR = 50 \times 7.5 = 375 ); ( TC = 100 + 20(7.5) + 2(56.25) = 100 + 150 + 112.5 = 362.5 ); Profit = $12.50.

This is a request for a specific instructional resource, likely from a high school Advanced Placement (AP) Economics or college introductory microeconomics curriculum (often associated with the Advanced Placement Economics teacher resource manual from the National Council on Economic Education).

Calculate the profit-maximizing quantity. Solution: ( MC = 20 + 4Q ). Set ( P = MC ) → ( 50 = 20 + 4Q ) → ( Q = 7.5 ).