Because Vaughn Motors operates in a very competitive environment, it is essential for the management team to understand its cost structure and how it affects the company's profitability. For one of its key products, Vaughn notes a selling price of $12 and a variable cost of $3 per unit. Fixed costs associated with this product line are $16,500. Vaughn Motors is subject to a tax rate of 25%. If Vaughn wants to generate operating income of $15,900, how many units of this product must be sold? Number of units to be sold units How many must be sold to generate $16,650 of after-tax income? Number of units to be sold units