Ritchie manufacturing company makes a product that it sells for $170 per unit. the company incurs variable manufacturing costs of $86 per unit. variable selling expenses are $16 per unit, annual fixed manufacturing costs are $458,000, and fixed selling and administrative costs are $242,400 per year. required determine the break-even point in units and dollars using each of the following approaches: use the equation method. use the contribution margin per unit approach. use the contribution margin ratio approach. prepare a contribution margin income statement for the break-even sales volume.