Bob is building a backyard play-ground for his grandchildren and wishes to put down rubber mulch to provide safety from falls. Bob wishes to put the mulch in a pit in the shape of a rectangular solid 20 ft long, 15 ft wide, and 9 in. deep.

(a) Determine the volume, in cubic feet, of mulch Bob will need. 

(b) If mulch costs $11 per cubic foot, what will the cost of the mulch be?

Solve the given problem. When appropriate, use the π key on your calculator and round your answer to the nearest hundredth.