Ritchie Manufacturing Company makes a product that it sells for $150 per unit. The company incurs variable manufacturing costs of $60 per unit. Variable selling expenses are $ 18 per unit, annual fixed manufacturing costs are $480,000, and fixed selling and administrative costs are $240,000 per year. Required Determine the break-even point in units and dollars using each of the following approaches: a. Use the equation method. b. Use the contribution margin per unit approach. c. Use the contribution margin ratio approach. d. Confirm your results by preparing a contribution margin income statement for the break-even sales volume