Tanner Company's most recent contribution format income statement is presented below: The company sells its only product for $15 per unit. There were no beginning or ending inventories. Required: a. Compute the company's break-even point in units sold. b. Compute the total variable expenses at the break-even point. c. How many units would have to be sold to earn a target profit of $9,000 ? d. The sales manager is convinced that a $6,000 increase in the advertising budget would increase total sales by $25,000. Would you advise the increased advertising outlay