
Answer:
$18,000
Explanation:
The computation of overall effect on the company's monthly net operating income is shown below:-
                 Current         Proposed
Sales            $800,000        $837,000
            (200 × 4000)   (200 - 14) × (4,000 + 500)
Variable expenses  $160,000       $180,000
               (40 × 4000)  (40 × (4,000 + 500))
Contribution margin $640,000 Â Â Â Â Â Â $657,000
Fixed expenses   $531000         $566,000
                         ($531,000 + $35,000)
Net operating
income          $109,000         $91,000
Decrease in net operating income = Current - Proposed
= $109,000 - $91,000
= $18,000
So, for computing the overall effect on the company's monthly net operating income we simply applied the above formula.