Average of money that group of 4 friends pay for rent each month is $800.After one persons rent is increased by 20% the new mean is $880.What was original rent of friend whose rent is increased?
Answers.
A) 800  B) 900  C) 1600  D) 1100  E) 1200
0.2X = 4(880-800)   0.2X = 320   X = 1600   Answer 1600
<result>C</result>
Average of money that group of 4 friends pay for rent each month is $800.After one persons rent is increased by 20% the new mean is $880.What was original rent of friend whose rent is increased?