Yes, Carlos should accept the offer because the marginal benefit exceeds the marginal cost.
Benefit of the complete trip = 20 seat * $10 per person per
Benefit of the complete trip = $200
Carlos' cost of the trip is $140.
Benefit of the incomplete seat trip = 19 seat * $10 + 19*$5
Benefit of the incomplete seat trip = $190 + $95
Benefit of the incomplete seat trip = $285
In conclusion, the answer is yes because since the marginal benefit exceeds the marginal cost.
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