Use the high-low method to determine the variable and fixed cost components of Swift Change's operating costs. Use this information to project the monthly operating costs for a month in which the company performs 3,900 oil changes. (Click the icon to view the data.) Use the high-low method to determine the variable and fixed costs components of Swift Change's operating cost equation. First identify the formula and calculate the variable cost component (slope). (Round your answer to the nearest cent.) Variable cost per unit Change in costs Change in volume Total fixed cost Total mixed cost Total variable cost Variable cost per unit Data table Month January February Number of Oil Changes Operating Expenses 3,700 35,500 3,100 31,500 March... 3,300 32,500 April ... 3,200 32,000 May. 4,100 36,500 June 3,400 33,000 Print Done