Russell Preston delivers parts for several local auto parts stores. He charges clients 0.95 per mile driven. Russell has determined that if he drives 4,000 miles in a month, his average operating cost is $0.75 per mile. If he drives 6,000 miles in a month, his average operating cost is $0.65 per mile. Russell has used the high-low method to determine that his monthly cost equation is: total cost = $800.00 + $0.45 per mile. Required: 1. Determine how many miles Russell needs to drive to break even. 2. Assume Russell drove 1,900 miles last month. Without making any additional calculations, determine whether he earned a profit or a loss last month. Profit Loss 3. Determine how many miles Russell must drive to earn $1,300.00 in profit. 4-a. Prepare a contribution margin income statement assuming Russell drove 1,900 miles last month. (Enter your answers rounded to 2 decimal places.) 4-b. Use the above information to calculate Russells degree of operating leverage. (Round your answer to the 2 decimal places.)