How much does your employer pay into the social security system on your behalf? a - 4.2 percent b - 8.4 percent c - 6.2 percent d - 12.4 percent

Workers pay an average of 6.2 percent which is 127,000 a year. But employers pay a matching amount for a combined contribution of 12.4 percent of earnings.

Meaning you are either getting 6.2 percent for being a WORKER.
or getting 12.4 percent for being a EMPLOYER.

In this question you are looking for employer so the answer is 12.4