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: 18.05 ã — 0.001 = ?
Options: a. 0.1805, b. 0.01805, c. 1.805, d. 0.001805, e. none of these
[EX A]: b

[EX Q]: Problem: if the average of 5 positive integers is 50 and the difference between the largest and the smallest of these 5 numbers is 10, what is the maximum value possible for the largest of these 5 integers ?
Options: a. 50, b. 58, c. 49, d. 48, e. 44
[EX A]: b

[EX Q]: Problem: a sum of money deposited at c. i. amounts to rs. 2420 in 2 years and to rs. 2662 in 3 years. find the rate percent ?
Options: a. 23 %, b. 10 %, c. 32 %, d. 98 %, e. 31 %
[EX A]:
b