Answer:
B.25.0%
Explanation:
For computing the overall contribution margin ratio, we have to first compute the weightage
                                (A)         (B)         (A × B)
Product     Monthly sales in dollars  Weightage  CM ratio   Overall CM ratio
Product A Â Â $120,000 Â Â Â Â Â Â Â Â Â Â Â Â Â 25% Â Â Â Â Â Â Â 20% Â Â Â Â Â 5%
Product B Â Â $160,000 Â Â Â Â Â Â Â Â Â Â Â Â Â 33.33% Â Â Â Â 40% Â Â Â Â Â 13.33%
Product C Â Â $200,000 Â Â Â Â Â Â Â Â Â Â Â Â 41.67% Â Â Â Â Â 16% Â Â Â Â Â 6.67%
Total       $480,000              100%                25%