Jackson and Ashley Turner (both 45 years old) are married and want to contribute to a Roth IRA for Ashley. In 2018, their AGI is $193,800. Jackson and Ashley each earned half of the income.

a.) How much can Ashley contribute to her Roth IRA if they file a joint return?

b.) How much can Ashley contribute if she files a separate return?

c.) Assume that Ashley earned all of the couples income and that she contributed the maximum amount she is allowed to contribute to a Roth IRA. What amount can be contributed to Jacksons Roth IRA if they file a joint return?