The marketing research department for a toy company used a large city to test market their new super ball that bounces over fifty feet in the air. They found that the weekly revenue can be approximated by R(x) = 80x { x 2 , and the weekly total costs can be approximated by C(x) = 800+401 , x 150, where x represents the number of super balls sold per week. Determine the number of super balls that must be sold to maximize the and find the (15 pts)