Answer:
$225,400
Step-by-step explanation:
The computation of total contribution margin under variable costing is shown below:-
Sales (4900 × $88) $431,200 
Less:Variable cost 
Direct material (4900 × $12) ($58,800) 
Direct labor (4900 × 23) ($112,700) 
Variable manufacturing overhead 
(4900 × 2) ($9,800) 
Variable selling and administrative 
expenses (4900 × $5) ($24,500) 
Total variable expenses ($205,800) 
Contribution margin $225,400
Therefore the total contribution margin under variable costing is $225,400