Answer:
$100,000
Step-by-step explanation:
Contribution Margin=Sales Revenue − Variable Costs
For segment 1
Sales = $500,000
Variable costs = $400,000
Contribution Margin = $100,000
Therefore the contribution margin presented for segment number 1 is $100,000 while the attributable common cost for segment 1 will be (0.6*320,000) = $192,000