* You have a 20 ft by 20 ft area in your back yard, next to the pool deck, that you want to
do something with because you are tired of mowing it and all the grass going into the
pool. You decided to create a fire pit area that you found on Pinterest. This idea creates
a firepit in the center with a circular seating area around the pit and then mulch
covering the rest of the area. A sketch of what you want is shown below.
You job is to calculate the total coast of this project. All the dimensions of the project
are given to you. To do this you will need to find the volume of rock and mulch you will
need to do this project. The mulch and rock will both be 3 inches thick.