Answer:
The overall effect on the company's monthly net operating income of this change is $40,960
Explanation:
New contribution margin ($154 - $11)=143
New unit monthly sales (9,800 + 320)=10,120
New total contribution margin (10,120 units * 143 per unit)= 1,447,160
Present total contribution margin (9,800 units * 154 per unit)=1,509,200
Changes in total contribution margin=(62,040)
Plus Savings in sales person's salaries= 103,000
Change in net operating income $40,960