Corbett's AMTI is $600,000. What is his AMT exemption under the following alternative circumstances? Exhibit 8-5.

EXHIBIT 3-5 2020 AMT Exemptions Filing Status Exemption Married filing jointly Married filing separately Head of household and single $113,400 56,700 72.900 Phase-Out Begins at Phase-Out Complete for This Level of This Level of AMTI AMTI $1,036,800 $1.490.400 518.400 745,200 518,400 810,000 a. He is married and files a joint return. Amount of AMT exemption b. He is married and files a separate return. Amount of AMT exemption c. His filing status is single. Amount of AMT exemption d. His filing status is head of household. Amount of AMT exemption