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Penn Company produces a product sold for $40 per unit. Variable and fixed cost information is presented below: Variable costs per unit Manufacturing ...... Selling and administrative Total ... $ 8 2 Fixed costs per month Manufacturing ...... Selling and administrative Total .... $29,000 16,000 $45,000 $10 With an income tax rate of 40 percent, the sales volume required for a monthly after-tax profit of $36,000 is