Answer:
a. Particulars Amount
Sales $740,000
Less: Variable cost of goods sold $355,200
Manufacturing margin $384,800
b.Particulars Amount
Manufacturing margin $384,800
Less: Variable selling and administrative expenses $81,400
Contribution margin $303,400
c. Particulars Amount
Contribution margin $303,400
Less: Fixed costs $162,800 ($118,400+$44,400)
Income from operations $140,600