On a trip, a motorist purchased gasoline as follows: 56 liters at $1.18 per liter; 64 liters at $1.265 per liter; 70 liters at $1.236 per liter; and 54 liters at $1.225 per liter.
(a) What was the average number of liters per purchase?
(b) What was the average cost per liter?
(c) If the motorist averaged 8.75 km per liter, what was the average cost of gaso-line per kilometer?
Solve the following problem involving an arithmetic average.