The average (arithmetic mean) monthly income of four workers is $5,000. After one worker’s income increases by 25 percent the new average income is $5,200. What was the original income of the worker whose monthly income increased?
Choose the correct option.
A) $3,300 B) $3,600 C) $3,800 D) $4,200 E) $3,200
Increase in total income was 200*4= 
<gadget id="calculator">200*4</gadget>
<output>800</output>
$800, we know that this increase was 25% (1/4th) of the workers original income, thus his/her original income was 800*4=$3,200.   Answer:$3,200
<result>E</result>
The average (arithmetic mean) monthly income of four workers is $5,000. After one worker’s income increases by 25 percent the new average income is $5,200. What was the original income of the worker whose monthly income increased?