I just need proper work shown for this problem. The correct answer is down below.

1. 3,000 units: $72,250

2. 5,000 units: $158,750

3. 7,000 units: $272,250

Apex Office Solutions sells its printers for office use. The printers sell for $72 per unit. Variable costs are $15.25 per unit. Total fixed costs are $98,000 per month for volumes up to 4,500 units. Above 4,500 units, total monthly fixed costs are $125,000. Using flexible budgets, find operating income at volume levels of 3,000 units, 5,000 units, and 7,000 units