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 $860.What was original rent of friend whose rent is increased? Choices.
A) 800  B) 900  C) 1000  D) 1100  E) 1200

Rationale: "0.2 x = 4 ( 860 - 800 ) 0.2 x = 240 x = 1200 answer e"
Answer: E