4. In 2020, Sara who is single, had $150,000 of regular taxable income. She had the following itemized deductions: Mortgage Interest paid of $9.675 (acquisition debt of ($400,000) Allowed Medical deduction on Schedule A of $450 after taking the 7.5% disallowed Real Estate Taxes paid of $5,500 State income taxes withheld of $7,500 Charity contributions of $2,000 She also received tax exempt interest of $2,500 from a municipal bond and was notified that $1,275 of it was private activity interest. She also received a refund of state taxes of $550, and she itemized in 2019 and all of this amount was determined to be a tax benefit in 2018 taxes. a. What is Sara's AMTI this year if she deducted $15,000 of itemized deductions last year and did not owe any AMT last year? Complete Form 6251 up to line 4 on first page. b. What is Sara's AMTI this year if she took the standard deduction in 2019 and she dia not owe any AMT last year? Complete Form 6251 up to line 4 on first page. 4. In 2020, Sara who is single, had $150,000 of regular taxable income. She had the following itemized deductions: Mortgage Interest paid of $9.675 (acquisition debt of ($400,000) Allowed Medical deduction on Schedule A of $450 after taking the 7.5% disallowed Real Estate Taxes paid of $5,500 State income taxes withheld of $7,500 Charity contributions of $2,000 She also received tax exempt interest of $2,500 from a municipal bond and was notified that $1,275 of it was private activity interest. She also received a refund of state taxes of $550, and she itemized in 2019 and all of this amount was determined to be a tax benefit in 2018 taxes. a. What is Sara's AMTI this year if she deducted $15,000 of itemized deductions last year and did not owe any AMT last year? Complete Form 6251 up to line 4 on first page. b. What is Sara's AMTI this year if she took the standard deduction in 2019 and she dia not owe any AMT last year? Complete Form 6251 up to line 4 on first page