You are about to begin work on a swimming pool in your yard. The first step is to have a hole dug that is $\displaystyle {8}$ yards long, $\displaystyle {4}$ yards wide, and 4 yards deep. You will use a truck that can carry 24 cubic yards of dirt and charges $$\displaystyle {20}$ per trip. How much will it cost you to have all the dirt hauled away?

The cost is $