After purchasing a coffee cup from your local gas station for $5.00, you can always refill your cup for $0.50. The marginal cost of your 10th cup of coffee purchased at the gas station is:a.$5.00. b.$5.50. c.$0.50. d.$10.00.

c.$0.50

Explanation:

Marginal Cost is the cost of one more unit of a prodcut.

The cost of each refill is $0.50. Therefore, the marginal cost of the 10th is $0.50

I hope my answer helps you

you can lose ranking 2 ways.

1) you don't have enough points due to you expending them by asking questions/your answers are deleted.

2) your brainliest's expired. this means that brainliests, once they exceed the 30 day limit, expires. this is to ensure that you continue to contribute into the community at a constant rank if you want to continue to have/exceed the rank you have right now.

if you go to profile, and click "show more information" located on the bottom left of the box with your information (on top of the questions answered, questions asked, and friends), you will be given the following information (example):

member since : 02/13/2017, 18: 11

questions answered: 9741

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brainliest answers in last 30 days: 10

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look at the "brainliest answers in the last 30 days". this is the one that will affect your rank other than your points. again, once your brainliest expires (was earned 31+ days ago), it will not be counted.

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