The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 50 kg. What might be the weight of the new person?  Select the correct option
A) 70 kg B) 80 kg C) 85 kg D) 90 kg E) 95 kg

Rationale: "total weight increased = ( 8 x 2.5 ) kg = 20 kg . weight of new person = ( 50 + 20 ) kg = 70 kg . a )"
Answer: A