Question

At your local family fun center, miniature golf is $12 per person for unlimited rounds in a day, while each go-kart session is $8. If you played 3 rounds of miniature golf and rode the go-karts 3 times, what was the marginal cost of the 3rd round of miniature golf? What was the marginal cost of the 3rd go-kart session?

Answer 1

The marginal cost of the 3rd round of miniature golf would be $0 because you pay one fee of $12 for unlimited rounds.
The marginal cost of the 3rd go-kart session would be $8 because each round cost is $8.