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
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Q: Question: In a queue that comprises of 7 students. Sam and Tom are in the queue, what is the probability that they will be standing next to each other in the queue?

 Option A:  7%

 Option B:  14%

 Option C:  21%

 Option D:  28%

 Option E:  35%

A: Option C
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Q: Question: ratio and addition of time on principal amount 500 with two different rate are 3:5 and 16
respectively.given rates are 2% and 3% respectively.what will be simple interest on both case?

 Option A: 30,50

 Option B: 100,150

 Option C: 80,150

 Option D: 60,150

 Option E: 60,100

A:
Option D
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