Answer:
$35,708.4
Step-by-step explanation:
His net income will be the total that he earns less the taxes.
So, we need to calculate how much money does Rob pays for each tax.
Therefore, 6.2% of 4200 is equal to:

It means that Rob pays $260.4 each month for social security,
In the same way, 1.45% of 4200 is equal to:

16% of 4200 is equal to:

5.5% of 4200 is equal to:

Now, we can calculate the net income per month as:
$4200 - $260.4 - $60.9 - $672 - $231 = $2975.7
Finally, his annually net income will be the net income per month multiplied by 12 months:
$2975.7 x 12 = $35,708.4
So, the answer is $35,708.4