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.

[EX Q]: Problem: the average weight of a, b and c is 43 kg. if the average weight of a and b be 48 kg and that of b and c be 42 kg, then the weight of b is :
Options: a. 55 kg, b. 53 kg, c. 49 kg, d. 52 kg, e. 51 kg
[EX A]: e

[EX Q]: Problem: the length of a rectangular floor is more than its breadth by 100 %. if rs. 600 is required to paint the floor at the rate of rs. 3 per sq m, then what would be the length of the floor ?
Options: a. 15.0 m., b. 14.4 m., c. 12.0 m., d. 16.2 m., e. 16.5 m.
[EX A]: b

[EX 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
[EX A]:
b