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!