Answer:
Total money made as a physician = $138,000
Medicare tax = 1.45% of $138,000
= 1.45/100 * $138,000 = $2001
security tax = 6.2 %of $138,000
= 6.2/100 * $138,000 = $8556
= $138,000 - ($2001 + $8556)
$138,000 - $10557
= $127,443 is paid by Christian in FICA taxes
hope it helps you