In 2015, Jeff, who is single, is entitled to the following deductions before phase-outs: State income taxes...........................................$7,850

Question:

In 2015, Jeff, who is single, is entitled to the following deductions before phase-outs:
State income taxes...........................................$7,850
Real estate taxes...............................................1,900
Home mortgage interest.......................................8,200
Charitable contributions.......................................1,700
a) Assume that Jeff's AGI is $280,000. Calculate Jeff's itemized deductions after considering the overall phase-out of itemized deductions.
b) Suppose that Jeff's AGI increases to $1,280,000. Calculate Jeff's itemized deductions after considering the overall phase-out of itemized deductions.