Mazoon Company sells yachts. During the current year 100 yachts were sold resulting in $420,000 of sales revenue, $120,000 of variable costs, and $180,000 of fixed costs. The number of yachts that must be sold to achieve $150,000 of operating income is: a. 3300 units Ob 110 units c 100 units Od 40 units Oe. None of the given answers