First, we need to calculate 7.5% of the adjusted gross income:
7.5% of $28,000 = 0.075 x $28,000 = $2,100
Since the medical expenses exceed $2,100, we can deduct the amount that exceeds this limit:
$7,100 - $2,100 = $5,000
Therefore, the amount of the medical expenses deduction would be $5,000.