Each year around July 4 the town of Flagston has a controversy over how big a fireworks display they should have on the holiday. The three citizens have the demand functions for fireworks that are shown here. The cost per firecracker is $18. Elmer has the demand function P = 20 - Q. Ethel's demand equation is P = 12 - 0.6Q, and Edith has the demand P = 8 - 0.4Q. a) What is the total community demand equation (or aggregate willingness to pay) for the fireworks display