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: the cash realised on selling a 14 % stock is rs. 109.25, brokerage being 1 / 4 % is ?
Options: a. 366, b. 106, c. 102, d. 109, e. 122

A: d
****
Q: Problem: the arithmetic mean and standard deviation of a certain normal distribution are 14.5 and 1.7, respectively. what value is exactly 2 standard deviations less than the mean ?
Options: a. 10.5, b. 11, c. 11.1, d. 12, e. 12.5

A: c
****
Q: Problem: the population of a city increases by 4 % per year but due to migration it decrease by 1 % per years. what will be the percentage increase in population in 3 years ?
Options: a. 9 %, b. 9.27 %, c. 27 %, d. 12 %, e. none of these

A:
b
****