Final answer:
The given information does not provide enough details to calculate the marginal tax rate for year 3.
Step-by-step explanation:
The marginal tax rate is the rate at which an additional dollar of income is taxed. In this case, we need to determine the marginal tax rate for year 3.
Unfortunately, the given information does not provide any specific details about the income range or tax rates for year 3, so it is not possible to calculate the marginal tax rate without that information. It is important to have the appropriate data to accurately determine the marginal tax rate for a specific year.