Answer:
Contribution margin ratio = Contribution margin / Sales
Product C90B CMR = ($23,490 - $7,047) / $23,490 = $16,443 / $23,490 = 0.7 = 70%
Product Y45E CMR = ($34,800 - $13,920) / $34,800 = $20,880 / $34,800 = 0.6 = 60%
The rule, the Higher the contribution margin ratio, the lower the Break-Even point. So, if sales mix shifts to product C90B, overall Break-even point Decreases.