Montclair company earns an average contribution margin ratio of 40% on its sales. the local store manager estimates that he can increase monthly sales volume by $45,000 by spending an additional $7,000 per month for direct mail advertising. compute the monthly increase in operating income if the manager's estimate about the increased sales volume is accurate(a) $11,000.(b) $23,000.(c) $16,000.(d) $18,000.

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