Answer and Explanation:
The computation of each year’s absorption costing net operating income is shown below:-
Particulars             Year 1      Year 2      Year 3
Beginning inventories    210       150          200
Less: Ending inventories  150       200          240
Change in inventories    60        -50          -40
Fixed Manufacturing Overhead
Beginning Inventory    $115,500    $82,500     $110,000
               ($550 × 210) ($550 × 150) ($550 × 200)
Less: Fixed Manufacturing
Overhead in ending
inventory              $82,500   $110,000     $132,000
               ($550 × 150) ($550 × 200) ($550 × 240)
Fixed Manufacturing
Overhead deferred
in (released from)
inventory             $33,000   -$27,500     -$22,000
Variable Costing
net Operating
income               $290,000  $279,000    $260,000
Add (deduct) Fixed MOH cost
deferred in (released from)
inventory under absorption
costing                -$33,000   +$27,500     +$22,000
Absorption costing net
operating income       $257,000  $306,500     $282,000