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.

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
Option D

Question: How many factors does 36^2 have?

 Option A: 2

 Option B: 8

 Option C: 24

 Option D: 25

 Option E: 26
Option D

Question: Machine R and machine B are each used to manufacture 660 sprockets. It takes machine R 10 hours longer to produce 660 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine R. How many sprockets per hour does machine R produces?

 Option A: 6

 Option B: 6.6

 Option C: 60

 Option D: 100

 Option E: 110

Option A