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: Rahul went to a shop and bought things worth Rs. 50, out of which 80 Paise went on sales tax on taxable purchases. If the tax rate was 8%, then what was the cost of the tax free items?

Option A: 21.4

Option B: 12.4

Option C: 41.2

Option D: 39.2

Option E: 32.9
[A]: Option D

[Q]: Question: A rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 10 metres apart, how many poles will be needed ?

Option A: 28

Option B: 56

Option C: 57

Option D: 58

Option E: None of these
[A]: Option A

[Q]: Question: .It was calculated that 75 men could complete a piece of work in 20 days. When work was scheduled to commence, it was found necessary to send 25 men to another project. How much longer will it take to complete the work?

Option A: 20 days.

Option B: 23 days.

Option C: 30 days.

Option D: 92 days.

Option E: 97 days.
[A]:
Option C