This year, 1,272 students enrolled in night classes at a local college. Last year, only 1,200 students enrolled. What was the percent increase in the enrollment? Which operation will you use in your first step? A. 6%
B. 15%
C. 18%
D. 94%

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.