The marginal cost of the second meal deal is $5.
<h3>What is the marginal cost?</h3>
The marginal cost is the change in total cost when consumption is increased by one unit.
Marginal cost = change in total cost / change in consumption
($15 - $10) / (2 - 1) = $5
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Just by looking at the answer you can take out D because C already offers no tax and 5% off, do C is better than D, so we only have to do t math for A, B, and CA is 800 plus tax, with $75 back800×1.05 (because it's 5% tax) -75 =$765B is 800×.90 (because 10% off means he's paying 90%)×.05=$756C is 800×.95 (because 5% off means he's paying 95%) =760A=765B=756C=760So B is the best deal
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