PainFree sels its main product, ergonomic mouse pads, for $13 each. Its variable cost is $5.50 per pad. Fixed costs are $220,000 per month for volumes up to 65,000 pads. Above 65,000 pads, monthly fixed costs are variable costs, fxed costs, and operating income for volume levels of 40,000, 50,000, and 75,000 pads Per Unit 50.000 75,000 7 5 6 8