Jeff Jones earns $1,200 per week. He's married and claims four withholding allowances. The social security rate is 6.2% on $118,500, and Medicare is 1.45%. Each paycheck, his employer also deducts $42.50 for health insurance. What's his net pay?

I know that I take the heath insurance for anything else is done. Which is $1200.00 minus $42.50 which gives me a balance amount $1157.50

Here is where I am confused, the problem states that SS tax is on the first $118,500.  Am I supposed to take the weekly pay which is not the $118,500 so calculating the $1200 .  Or am I supposed to the weekly pay time 48 weeks then subtract the $118,500.