Could you please answer all the questions? Thank you.

Joyce Murphy runs a courier service in downtown Seattle. She charges clients $0.50 per mile driven. Joyce has determined that if she drives 3.300 miles in a month, her total operating cost is $875. If she drives 4.400 miles in a month, her total operating cost is $1, 095. Joyce has used the high-low method to determine that her monthly cost equation is: total monthly cost = $215 + $0.20 per mile driven. 1. Determine how many miles Joyce needs to drive to break even. (Round your intermediate calculations to 2 decimal places and final answer to the nearest whole number.) 2. Calculate Joyce's degree of operating leverage if she drives 4.200 miles. (Round your intermediate calculations to 2 decimal places and final answer to 4 decimal places.) 3. Suppose Joyce took a week off and her sales for the month decreased by 25 percent. Using the degree of operating leverage, calculate the effect this will have on her profit for that month. (Round your intermediate calculations and final answer to 4 decimal places.)