Use the high-low method to determine the variable and fixed cost components of Quick Lube's operating costs. Use this information to project the monthly operating costs for a month in which the company performs $3,900 oil changes.

Month January February March April May June Number of Oil Changes Operating Expenses 3,700 34,500 3,100 30,500 31,500 3,300 31,000 3,200 4,100 35,500 32,000 3,400