The average (arithmetic mean) monthly income of four workers is $2,000. After one worker’s income increases by 25 percent the new average income is $2,250. What was the original income of the worker whose monthly income increased?  Choose the correct choice from the following answers.
A) $3,000 B) $2,000 C) $4,000 D) $5,000 E) $6,000
Increase in total income was 250*4= 
<gadget id="calculator">250*4</gadget>
<output>1_000</output>
$1000, we know that this increase was 25% (1/4th) of the workers original income, thus his/her original income was 1000*4=$4,000   Answer: $4,000
<result>C</result>
The average (arithmetic mean) monthly income of four workers is $2,000. After one worker’s income increases by 25 percent the new average income is $2,250. What was the original income of the worker whose monthly income increased?