The average weight of 8 person's increases by 4 kg when a new person comes in place of one of them weighing 55 kg. What might be the weight of the new person?  Choose the correct choice from the following answers.
A) 80 kg  B) 87 kg  C) 90 kg  D) 100 kg  E) 110 kg

Rationale: "total weight increased = ( 8 x 4 ) kg = 32 kg . weight of new person = ( 55 + 32 ) kg = 87 kg . b )"
Answer: B