9 people are planning to share equally the cost of a rental van . if one person withdraws from the arrangement and the others share equally the cost of the rental van , then the share of each of the remaining people will increase by . . . ?  Select:
A) 1 / 9  B) 1 / 8  C) 1 / 7  D) 7 / 8  E) 8 / 7

Rationale: let p = total cost of the rental van . the original share per person is p / 9 . the new share per person is p / 8 . p / 8 = p / 9 * 9 / 8 = ( 1 + 1 / 8 ) * original share the answer is b .
Answer: B