6 The following is Allison Corporation's contribution format income statement for last month: sales 800000 variable expenses 300000 contribution margin 500000 fixed expenses 400000 net operating income 100000 The company has no beginning or ending inventories. The company produced and sold 10,000 units last month. What is the company's break-even sales in dollars? A $640,000 B $700,000 C $0 D $400,000