Since 50% of the sales are derived from selling at VC, the CM must be made up from the other 50% of sales (since no contribution margin results from a sales price equal to the variable cost). Therefore, if the other sales decrease by 20%, then CM must decrease by $7,200 ($36,000 × 20%). If fixed costs decrease by 15%, or $6,000 ($40,000 × 15%) then the monthly net decrease in Korbin's operating income would be $1,200. This answer represents the reduction in CM ($36,000 × 20%). The correct answer is $(1,200). Please see correct answer for an explanation. This answer $(5,200) represents the new segment margin ($28,800 ? $34,000).
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