average contribution margin ratio

Assume MIX Incorporated has sales volume of $1,000,000 for two products with May sales and contribution margin ratios as follows: Product A: Sales $400,000; Contribution Margin Ratio 30% Product B: Sales \$600,000; Contribution Margin Ratio 60% Required: Assume MIX's fixed expenses are $300,000. Calculate the May total contribution margin, operating income, average contribution margin ratio, and breakeven sales volume