Question 17 (4 points) Listen The following information is available for Redwood Corporation for a sales volume of 500 stereo speakers for the past month: Total Per Unit Sales $112,500 $225 Less: Variable expenses 40,000 80 Contribution margin 72,500 $145 Less: Fixed expenses 17,500 Net operating income $ 55,000 If sales increase by $51,750, net income will increase by what amount? $20,000 $30,000 $33,350 $22,000