6. Minist Corporation sells a single product for $15 per unit. Last year, the company's sales revenue was $225,000 and its net operating income was $18,000. If fixed expenses totaled $72,000 for the year, the break-even point in unit sales was (choose the closest answer): A. 15,000 B. 9,900 C. 14,400 D. 12,000 E. 18,000