To create a garden bench, a concrete beam rests on two pillars. The beam is a rectangular prism with sides of length 3ft, 4ft and 0.5ft (Figure 1). The pillars are hollow wooden dowels that need to be filled with concrete to be stable (Figure 2). The pillars have a length of 2ft. The inner diameter of the pillar is 0.75ft and the out diameter is 1ft.

Find the volume of the whole bench. Round answers to the nearest tenth of a cm.
How many cubic feet of cement is needed to create the bench?
If cement costs $5.36/ft3 and wooden dowels are $8.72/ft, how much will it cost to create this bench?