The following is Arkadia Corporation's contribution format income statement for last month: Sale.$1200.000 Variable expenses.... 800,000 Contribution margin Fixed expenses300,000 Net operating incom... . 100.000 The company has no beginning or ending inventories and produced and sold 20,000 units during the month at a sales price of $60 per unit.. 400,000 How many units would the company have to sell to attain an after-tax net income of $50,000, assuming an income tax rate of 20%? 20,400 units 18,125 units 15,500 units 19,650 units None of the above