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.

Input: Consider Input: Problem: if y > 0, ( 9 y ) / 20 + ( 3 y ) / 10 is what percent of y ?
Options: a. 40 %, b. 50 %, c. 60 %, d. 70 %, e. 75 %

Output: e


Input: Consider Input: 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 %

Output: e


Input: Consider Input: Problem: compound x contains elements a and b at an approximate ratio, by weight, of 2: 10. approximately how many grams of element b are there in 108 grams of compound x ?
Options: a. 90, b. 162, c. 250, d. 270, e. 322


Output: a