Answer:
$29,850
Explanation:
The computation of the increase in net operating income is shown below:
= Increase in sales - increase in variable expenses - advertising cost
where,
Increase in sales = $89,000
Increase in variable expenses is
= $89,000 × 35%
= $31,150
And, the advertising cost is $28,000
So, the increase in operating income is
= $89,000 - $31,150 - $28,000
= $29,850