Pete is making a bookcase for his books and other stuff, He already has plenty of bricks and can get planks of wood for $2.50 cach. Each plank of wood mcasures 1 inch by 9 inches by 48 inches. Each brick measures 3 inches by 45 inches by 9 inches. For each shelf, Pete will put three bricks at cach end then put a plank of wood on top. The diagram shows three shelves. inches 1. Pete wants five shelves in his bookcase. a. How many planks of wood does he need? b. How many bricks does he need? c. How high will the shelves be? d. How much will the bookcase cost?​