Exam Help Save& Exit Su 8 Montclair Company earns an average can increase monthly sales volume by $45.000 by spending an additional $7,000 per month for direct mail advertising the monthly increase in operating income if the manager's estimate about the increased sales volume is accurate. contribution margin ratio of 40% on its sales. The local store manager estimates that he Multiple Choice $11000 $23,000 516,000 $18.000 MacBook Pro 5 6 8 9 W E Ul