Number of Hours:0,  1,   2,   3,   4
Music Man:          38,60,82,104,126
Party Time:          28,54,80,106,132
After the first hour,  how does the cost of hiring each Dj increase when length of time increases by one hour?
Part B: What an equation to represent the cost of hiring each Dj for "h" hours.
Part C: Calculate the cost of hiring each DJ for 5 hours.