Stefan’s family rented a rototiller to prepare an area in their backyard for spring planting. The rental company charged an initial fee of $43 with an additional fee per hour. If they paid $64 after renting the rototiller for 7 hours, what was the hourly fee? If h represents the hourly fee, which equation models this problem?
a. h + 43 = 64
b. h = 64 + 43
c. 7h + 43 = 64
d. 7h + 7 = 64