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. Elmer has the demand function P = 20 - Q. Ethel's demand equation is P = 12 - .6Q, and Edith has the demand P = 8 - .4Q. The cost per firecracker is $18. What is the total community demand equation for the fireworks display? Sketch the individual demand curves and community demand curve.