Ethan is itemizing deductions on his federal income tax return and had $4200 in medical expenses last year. If his AGI was $39,000, and if medical expenses are deductible to the extent that they exceed 7.5% of a taxpayer's AGI, how much can Ethan deduct for medical expenses?

Ethan can deduct $1275 for medical expenses, as 7.5% of his AGI is $2925 (so from subtracting this amount from the total of his medical expenses $4200, and the result is the deductible excess = $1275).