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: Calculate the sum of first 60 natural numbers.

 Option A: 1839

 Option B: 2830

 Option C: 1830

 Option D: 1831

 Option E: 1835
[A]: Option C


[Q]: 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%
[A]: Option C


[Q]: Question: In order to obtain an income of Rs. 900 from 20% stock at Rs. 102, one must make an investment of

 Option A: Rs.6000

 Option B: Rs.4590

 Option C: Rs.4560

 Option D: Rs.4500

 Option E: Rs.4570
[A]:
Option B