Answer:
-$6,100
Explanation:
The computation of the overall effect on the company monthly net operating income is shown below:
But before that we need to do following calculations
New variable cost per unit is
= $39 per unit + $45 per unit
= $84 per unit
New contribution margin per unit is
= $260 per unit - $84 per unit
= $176 per unit
New unit monthly sales is
= 1,700 units + 400 units
= 2,100 units
Now New total contribution margin is
= 2,100 units × $176 per unit
= $369,600
And, the Current total contribution margin is
= 1,700 units × $221 per unit
= $375,700
Therefore the Change in total contribution margin and in net operating income is
= New total contribution margin - current total contribution margin
= $369,600 - $375,700
= -$6,100