This year, Randy paid $29,800 of interest on his residence. (Randy borrowed $474,000 to buy his residence, and it is currently worth $524,000.) Randy also paid $3,100 of interest on his car loan and $5,100 of margin interest to his stockbroker (investment interest expense). How much of this interest expense can Randy deduct as an itemized deduction under the following circumstances?

a.Randy received $2,680 of interest this year and no other investment income or expenses. His AGI is $75,000.

b.Randy had no investment income this year, and his AGI is $75,000.