Assume that a company operates a fleet of delivery trucks. If a truck is driven 80,000 miles during a year its average operating cost is 25 cents per mile. If a truck is driven only 60,000 miles during the year, its average operating cost is 30 cents per mile. Using the high-low method, which of the following equations best estimates the total mixed operating cost per year? Multiple Choice Y = $10.000 + $0.12% Y = $12,000+ $0.10X Y = $8,000 + $0.18X Y = $15.000 + $0.15X