I need help figuring out the computation of AMTI. Ive filled in what I know, I just dont understand how to do the AMTI portion.

Lynn, age 45, is single and has no dependents. Her income and expenses for 2019 are reported as follows.

Income
Salary	$233,000
Taxable interest on corporate bonds	13,700
Business income	64,000
Expenses
Home office expense deduction (associated with sole proprietorship)	3,200
State income taxes	6,000
Real property taxes	8,500
Home mortgage (qualified housing) interest	9,200
Home equity loan interest	2,500
Investment interest	15,500
Cash contributions to various charities	2,900

The $64,000 business income is from Apex Office Supplies Company, a sole proprietorship that Lynn owns and operates. Apex claimed MACRS depreciation of $3,175 on personal property used in the business and placed in service in the current year. Lynn received interest of $30,000 on City of Pensacola private activity bonds that were issued in 2013.

Based on the financial information presented above, compute Lynn's AMT for 2019. Ignore the one-half deduction for self-employment taxes for this problem.

Gross income			$ 310700
Less: deductions for AGI			3200
Adjusted gross income			$ 307500
Less: deductions from AGI			35800
Taxable income			$ 271700
Regular income tax calculation
Total tax			$ 70784.50
Computation of alternative minimum tax
Taxable income			$
Plus: positive adjustments and tax preferences
Less: negative adjustment
Alternative minimum taxable income
Less: AMT exemption			71700
AMT base			$
TMT			$
AMT			$