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This year Randy paid $$28,150$ of interest on his residence. $($Randy borrowed $$452,000$ to buy his residence, which is currently worth $$502,000.)$ Randy also paid $$2,550$ of interest on his car loan and $$4,275$ 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 $$2,240$ of interest this year and no other investment income or expenses. His AGI is $$75,000.$