Michael is single and 35 years old. He is a participant in his employer's sponsored retirement plan. How much can Michael contribute to a Roth IRA in 2020 in each of the following alternative situations? (Leave no answer blank. Enter zero if applicable.) a. Michael's AGI before the IRA contribution deduction is $50,000. Michael contributed $3,000 to a traditional IRA. Contribution to Roth IRA b. Michael's AGI is $80,000 before any IRA contributions. Contribution to Roth IRA c. Michael's AGl is $155,000 before any IRA contributions. Contribution to Roth IRA