Answer:
The total contribution margin for the month under variable costing is $103,360
Explanation:
Variable Costing Considers only variable manufacturing costs in the calculation of product costs. Fixed Manufacturing Costs are regarded as period cost using this method.
Sales ( $ 91 × 3,230 )                                     293,930
Less Cost of Goods Sold
Opening Stock                                   0
Add Cost of Goods Manufactured
Direct materials ( $ 22 × 3,800)                   83,600
Direct labor ( $ 32 × 3,800)                      121,600
Variable manufacturing overhead ( $ 5 × 3,800)     19,000
Less Closing Stock ( $ 22+$ 32+ $ 5) × 570        ( 33,630)   (190,570)
Contribution                                            103,360