Digital Displays Inc. makes computer monitors and sells them for $315 each. To break even, it needs to sell 525 monitors per month. If the fixed costs are $8,600 per month, what is the variable costs per monitor?

Bobble Roofing charges a flat rate of $1,500 for insulating roofs of townhouses. The monthly administrative costs of the company are $3,600, the cost of supplies is $140 per job, and wages are $290 per job. What was the company's profit or loss in a month during which it insulated 20 roofs?

Belle Inc. makes bags and sells them for $38 each. The total revenue at the break-even point is $94,012 per month and the contribution margin per bag is $29. What is the total revenue if the company sells 2,800 bags in a month?