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.
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Question: 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

Answer: Option D

Question: Question: If |x^2 20| = x, which of the following could be the value of x?

Option A: -5

Option B: -4

Option C: 1

Option D: 4

Option E: 10

Answer: Option D

Question: Question: In how many ways can the letters of the word INTELLIGENCE be arranged?

Option A: 2580

Option B: 2500

Option C: 200067

Option D: 9979200

Option E: 3420456

Answer:
Option D