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.

Example Input: Problem: in a fuel station the service costs $ 1.65 per car, every liter of fuel costs 0.65 $. assuming that a company owns 12 cars and that every fuel tank contains 55 liters and they are all empty, how much money total will it cost to fuel all cars ?
Options: a. 320 $, b. 380 $, c. 420 $, d. 448.8 $, e. 480 $
Example Output: d

Example Input: Problem: if the simple interest on a certain sum of money for 6 years is one – fifth of the sum, then the rate of interest per annum is
Options: a. 3.3 %, b. 7.2 %, c. 6.1 %, d. 5.0 %, e. 3.1 %
Example Output: a

Example Input: Problem: a box contains 6 black, 8 red and 4 green marbles. 2 marbles are drawn from the box at random. what is the probability that both the marbles are of the same color ?
Options: a. 49 / 153, b. 18 / 153, c. 49 / 153, d. 40 / 153, e. 24 / 72
Example Output:
a