15 Russell Preston delivers parts for several local auto parts stores. He charges clients $0.80 per mile driven. Russell has determined that if he drives 4,000 miles in a month, his average operating cost is $0.65 per mile. If he drives 5,000 miles in a month, his average operating cost is $0.60 per mile. Russell has used the high-low method to determine that his monthly cost equation is total cost = $520 + $0.40 per mile. 10 points eBook Required: 1. Determine how many miles Russell needs to drive to break even. 2. Assume Russell drove 1,800 miles last month. Without making any additional calculations, determine whether he earned a profit or a loss last month. 3. Determine how many miles Russell must drive to earn $1,850 in profit. 4-a. Prepare a contribution margin income statement assuming Russell drove 1,800 miles last month. 4-b. Use the information provided in Req 4a to calculate Russell's degree of operating leverage. Print References Complete this question by entering your answers in the tabs below. Req 1 Req 2 Reg 3 Req 4A Req 4B Use the information provided in Req 4a to calculate Russell's degree of operating leverage. (Round your answer to the 2 decimal places.) Degree of Operating Leverage