Answer:
a. Contribution Margin = $21,200
Step-by-step explanation:
Contribution margin = Sales Value - Variable Expenses
Here it is provided that
Sales for Jones = $40,000
Less: Variable Expenses
Cost of goods sols = ($4,800)
Variable Promotion costs = ($8,000)
Variable Sales Commission = ($6,000)
Net Variable Expenses = ($18,800)
Contribution Margin = $40,000 - $18,800 = $21,200