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: man buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss percent is?

Option A: 12

Option B: 76

Option C: 26

Option D: 20

Option E: 12
[A]: Option D

[Q]: Question: Find the least number by which (59)(36)(17) has to be multiplied to obtain a perfect square?

Option A: 5

Option B: 17

Option C: 85

Option D: 221

Option E: 223
[A]: Option C

[Q]: Question: A committee of 5 people is to be selected from 7 people. How many different committees are possible?

Option A: 21

Option B: 40

Option C: 56

Option D: D.168

Option E: 336
[A]:
Option A