The following data pertain to the three products produced by Excellent Corporation: Fixed costs are $90,000 per month. $6.00 4.50 $1.50 $8.00 5.50 $2.50 $9.00 5.50 $3.50 Selling price per unit Variable costs per unit Contribution margin per unit The sales mix of Excellent Corporation consists of 65% of Product A, 20% of Product B, and 15% of Product C. What is the monthly break-even point for total units? a.50,000 units b.45,000 units c.36,000 units d.180,000 units