Answer with Step-by-step explanation:
We are given that
If you earned upto $113,700 in 2013 from an employer then your security tax=6.2% of income
If you earned over $113,700 then, you paid amount of tax=$7049.40
We have to find the money you would have made when you paid $4000 in social security tax in 2013.
Let x be the income and f(x) be the amount of tax.
Substitute the values then we get
$64516.13
When you would have mad $64516.13 then you paid $4000 in social security tax in 2013.