This fall Mark finally repaid his student loan. He originally borrowed the money to pay tuition several years ago, when she attended State University (a qualified educational institution). This year Mark paid a total of $2,400 of interest on the loan. If Mark files single and reports $75,000 of income and no other items of income or expense, how much of the interest can he deduct?Mark can deduct $2,400 for AGI. Mark can deduct $800 for AGI. Mark can deduct $1,600 for AGI. Mark can deduct $2,400 as an itemized deduction. Nonethe tuition is not deductible.