The average weight of 7 person's increases by 3.5 kg when a new person comes in place of one of them weighing 75 kg. What might be the weight of the new person?
Choose the correct choice from the following:
A) 74 kg B) 78.5 kg C) 99.5 kg D) data inadequate E) none of these

Rationale: "total weight increased = ( 7 x 3.5 ) kg = 24.5 kg . weight of new person = ( 75 + 24.5 ) kg = 99.5 kg . answer : option c"
Answer: C