please answer A, B, and C

Tanner Company's most recent contribution margin income statement is presented below: Sales Variable expenses Contribution margin Fixed expenses Net operating loss $75,000 45,000 30,000 36,000 ($6,000) The company sells its only product for $15 per unit. Required: a. Compute the company's break-even point inin units sold. b. How many units would have to be sold to earn a target profit of $9,000? C. The sales manager is convinced that a $6,000 increase in adverstising costs would increase total sales by 1,500 units. What would be the impact on operating income if this change were made? Should Tanner make the change