04x Help Save & Exe Unit $170 Sales 100% 20% Selling price Variable expenses 34 136 Contribution margin 80% :50 Fixed expenses total $1,032,000 per month. Timonen is currently selling 9,700 units per month. Timonen's sales manager would like to begin offering sales commissions as an incentive for the sales staff. The sales manager believes a commission of $12 per unit willl work well. In exchange for receiving the commission on each sale, the sales staff would accept an overall decrease in their salaries of $114,000 per month. The sales manager predicts that introducing this sales incentive would increase monthly sales by 430 units. Required: Calculate the overall effect on Timonen's monthly net operating income if this change is made. (Negative amounts/decreases should be indiceted by e minus sign. Omit the "$" sign in your response.) Change in net operating income