Following are the ratings and number of ad insertions on five cable TV programs designated as C1 through C5: C1 (rating = 7; insertions = 6); C2 (rating = 4; insertions = 12); C3 (rating = 3; insertions = 20); C4 (rating = 5; insertions = 10); C5 (rating = 6; insertions = 15). How many GRPs would be obtained from this cable TV advertising schedule?