Answer:
The net income be $27000 .
Option (C) is correct.
Explanation:
As given
You earn $30,000 per year and the federal tax rate is 10 percent. 
10% is written in the decimal form.

= 0.10 
Federal tax price = 0.10 × 30000
 = $ 3000
Thus
 Net income = Net earning - Federal tax
 = $30000 - $3000
 =$ 27000
Therefore the net income be $27000 .
 Option (C) is correct.