Mark Corporation produces two models of calculators. The Business model sells for $60, and the Math model for The variable expenses are given below: The fixed expenses are $75,000 per month. The expected monthly sales of each model are: Business, 1,000 units, Math, 500 units. The contribution margin ratio for the Business model is 40% 75% 85% 60% The break-even point in unit sales for the expected sales mix is closest to: 833 of each product 1, 667 Business Model and 833 Math Model 1, 667 of each product 833 Business Model and 1, 667 Math Model