Answer: A. 25%
Explanation:
The Contribution margin for the whole company = [tex]\frac{Total Contribution Margin Amounts}{Total Sales}[/tex]
Total Contribution Margin = (0.45 * 25,000) + (0.4 * 40,000) + ( 0.15 * 100,000)
= 9,000+16,000+15,000
= $40,000
Total Sales = 20,000+40,000+100,000
= $160,000
Contribution Margin for the whole Company = [tex]\frac{40,000}{160,000}[/tex]
= 25%
