The net operating income as per the variable costing method is $14500
<u>Explanation:</u>
The unit product cost is = $18 + $10 + $4 = $32
Sales revenue ( $78 multiply with 8700 units) = $678600
Variable cost:
Variable cost of goods sold ( 8700 units multiply $32) = $278400
Variable selling and administartive (8700 units multiply $5) = $43500
contribution margin = $356700
fixed manufacturing overhead = $255200
Fixed selling and adminstrative expenses = $87000
Net operating income = $14500
<u>Note:</u> contribution margin is calculated after deducting sales revenue with variable cost