an output (units) of 2, at a price of 16, and a marginal cost of 4. How do you get a marginal revenue of 14?

Please explain.

You have an output (units) of 2, at a price of 16, and a marginal cost of 4. How do you get a marginal revenue of 14?

You have an output (units) of 3, at a price of 14, and a marginal cost of 6.  How do you get a marginal revenue of 10?

Thank you!

 
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