Hercules Films is deciding on the price of the video release of its film Son of Frankenstein. Its marketing people estimate that at a price of p dollars, it can sell a total of q = 210,000 − 15,000p copies. (a) What is the revenue function? R(p)= (b) What price will bring in the greatest revenue? p = dollars Second derivative test: Your answer above is a critical point for the revenue function. To show it is a maximum, calculate the second derivative of the revenue function. R"(p)= Evaluate R"(p) at your critical point. The result is , which means that the revenue is at the critical point, and the critical point is a maximum.