Your sister is getting married this summer and she asked you to help her select a D. J. for the big event. You called around and found that Dave the D. J. charges a $150.00 set-up fee, plus $10.50 per hour. You discover Marvin’s Mobile Music Machine has a $135.00 set-up fee, plus $15.00 per hour. Which D. J. will you recommend to your sister? Be sure to clearly support your recommendation mathematically.