Please also show how you got each number, thanks!

Problem 17-48 Flexible Budget (LO 17-5) Oak Hill Township operates a motor pool with 20 vehicles. The motor pool furnishes gasoline, oil, and other supplies for the cars and hires one mechanic who does routine maintenance and minor repairs. Major repairs are done at a nearby commercial garage. A supervisor manages the operations. Each year, the supervisor prepares a master budget for the motor pool. Depreciation on the automobiles is recorded in the budget to determine the costs per mile. The following schedule presents the master budget for the year and for the month of July. OAK HILL TOWNSHIP Motor Pool Budget Report for July Annual Master One-Month Budget Master Budget $ 81,000 $ 6,750 7,200 600 5,400 450 12,000 1,000 60,000 5,000 52,800 4,400 $218,400 $18,200 900,000 75,000 $ 0.2427 $0.2427 Over-or (Under-) Budget $ 1,765 160 (350) Gasoline Oil, minor repairs, parts, and supplies Outside repairs Insurance Salaries and benefits Depreciation Total cost Total miles Cost per mile Number of automobiles 50 July Actual $ 8,515 760 100 1,050 5,000 4,620 $20,045 94,500 $0.2121 21 220 $ 1,845 20 The annual budget was based on the following assumptions: 1. Automobiles in the pool: 20. 2. Miles per year per automobile: 45,000. 3. Miles per gallon per automobile: 20. 4. Gas per gallon: $1.80. 5. Oil, minor repairs, parts, and supplies per mile: $0.008. 6. Outside repairs per automobile per year: $270. The supervisor is unhappy with the monthly report, claiming that it unfairly presents his performance for July. His previous employer used flexible budgeting to compare actual costs to budgeted amounts. Required: a. What is the gasoline monthly flexible budget and the resulting amount over- or underbudget? (Use miles as the activity base.) (Do not round intermediate calculations. If the amounts are equal to budget, select "No change".) Flexible budget Over budget b. What is the monthly flexible budget for the oil, minor repairs, parts, and supplies and the amount over- or underbudget? (Use miles as the activity base.) (Do not round intermediate calculations. If the amounts are equal to budget, select "No change".) Flexible budget Under budget c. What is the monthly flexible budget for salaries and benefits and the resulting amount over- or underbudget? (If the amounts are equal to budget, select "No change".) Flexible budget No change d. What is the major reason for the cost per mile to decrease from $0.2427 budgeted to $0.2121 actual? O Decreased unit fixed costs. O Decreased variable costs