Digital Displays Inc. makes computer monitors and sells them for $320 each. To break even, it needs to sell 520 monitors per month. If the fixed costs are $8,900 per month, what is the variable costs per monitor? Bobble Roofing charges a flat rate of $1,400 for insulating roofs of townhouses. Monthly administrative costs of the company are $3,550, cost of supplies is $130 per job, and wages are $300 per job. What was the company's profit or loss in a month during which it insulated 18 roofs