Answer:
$2,280 increase
Step-by-step explanation:
The computation of the change in net operating income is shown below:
= Increase in monthly sales unit × contribution margin per unit - increased monthly advertising
= 140 units × $52 - $5,000
= $7,280 - $5,000
= $2,280
Since this comes in a positive figure that results in increased in monthly net operating income we simply considered the change in monthly sales unit, monthly advertising, and the contribution margin per unit