The average weight of 8 person's increases by 2 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person? Choose the correct choice from the following choices:
A) 70 kg
B) 80 kg
C) 81 kg
D) 90 kg
E) 91 kg

Rationale: "total weight increased = ( 8 x 2 ) kg = 16 kg . weight of new person = ( 65 + 16 ) kg = 81 kg . c )"
Answer: C