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: On an order of 5 dozen boxes of a consumer product, a retailer receives an extra dozen free. This is equivalent to allowing him a discount of:

Option A: 15%

Option B: 16 1/6%

Option C: 16 2/3%

Option D: 20%

Option E: 30%
Option C

Question: A 300 m long train crosses a platform in 33 sec while it crosses a signal pole in 18 sec. What is the length of the platform?

Option A: 286 m

Option B: 250 m

Option C: 277 m

Option D: 278 m

Option E: 267 m
Option B

Question: The salary of a typist was at first raised by 10% and then the same was reduced by 5%. If he presently draws Rs.1045.What was his original salary?

Option A: 2999

Option B: 2777

Option C: 1000

Option D: 297

Option E: 2781
Option C