Records of Montes Services fuel oil consumption for the last six-month period show that Montes paid 59.7

Question:

Records of Montes Service’s fuel oil consumption for the last six-month period show that Montes paid 59.7 cents per liter for the first 1100 liters, 66.7 cents per liter for the next 1600 liters, and 76.5 cents per liter for the last delivery of 1400 liters, Determine the average cost of fuel oil per liter for the six-month period.
Solve the following problem involving an arithmetic average.