36. Rapid City is having its annual citywide celebration. The city wants to rent a bumper-car ride. The pieces used to make the floor are
4 foot-by-5 foot rectangles. The ride covers a rectangular space that is
40 feet by 120 feet.
a. How many rectangular floor pieces are needed?
b. The ride costs $20 per floor piece and $10 per bumper car. How
much would it cost Rapid City to rent the floor and the bumper
cars? (You will need to decide how many bumper cars will be
appropriate.)