Regal Inc. produces a product sold for $52 per unit. Variable and fixed cost information is presented below: Variable cpsts per unit Fixed costs per month Manufacturing $10 Manufacturing $33,000 Selling and administrative 2 Selling & Administrative 19.000 Total $12 Total $52,000 If Regal Inc. has an income tax rate of 40 percent, the sales volume required for a monthly after-tax profit of $48,000 is: 2,000 units 3,300 units 2,538 units 4,300 units None of these numbers is correct