Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[Q]: Problem: at what rate percent per annum will a sum of money double in 6 years.
Options: a. 12.5 %, b. 13.5 %, c. 11.5 %, d. 14.5 %, e. 16.6 %
[A]: e


[Q]: Problem: a merchant marks goods up by 80 % and then offers a discount on the marked price. the profit that the merchant makes after offering the discount is 35 %. what % discount did the merchant offer ?
Options: a. 20 %, b. 25 %, c. 30 %, d. 35 %, e. 40 %
[A]: b


[Q]: Problem: in an election between the two candidates, the candidates who gets 70 % of votes polled is winned by 280 vote ’ s majority. what is the total number of votes polled ?
Options: a. 750, b. 700, c. 800, d. 850, e. none of these
[A]:
b