If Empire Airlines accepts the offer, their contribution margin from that trip would be -$1,120
Contribution margin is calculated as:
= Revenue - Variable costs
The revenue the group is offering is $11,100.
The Variable costs are;
= Wages + Fuel + Food
= 7,100 + 4,600 + 520
= $12,220
The Contribution margin is:
= 11,100 - 12,220
= -$1,120
In conclusion, the contribution margin is -$1,120
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