You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[Q]: Question: The average weight of 10 person's increases by 4 kg when a new person comes in place of one of them weighing 70kg. What is the weight of the new person?

 Option A: 85

 Option B: 86.5

 Option C: 90

 Option D: 88.5

 Option E: 110
[A]: Option E


[Q]: Question: By selling 12 toffees for a rupee, a man loses 20%. How many for a rupee should be sell to get a gain of 20%?

 Option A: 5

 Option B: 8

 Option C: 10

 Option D: 15

 Option E: 20
[A]: Option B


[Q]: Question: Rahim bought 65 books for Rs.1160 from one shop and 50 books for Rs.920 from another. What is the average price he paid per book ?

 Option A: Rs.18.28

 Option B: Rs.20

 Option C: Rs.18.08

 Option D: Rs.28.08

 Option E: Rs.38.08
[A]:
Option C