ErgoPlus sells its main product, ergonomic mouse pads, for $13 each its variable cost is $570 per pad. Fixed costs are $210,000 per month for volumes up to 65,000 pads. Above 65,000 pads, monthly fixed costs are $260,000. Prepare a monthly flexible budget for the product, showng sales revenue, variable costs, fixed costs, and operating income for volume levels of 40,000,45,000, and 70,000 pads