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 Input:
Problem: to deliver an order on time, a company has to make 25 parts a day. after making 25 parts per day for 3 days, the company started to produce 5 more parts per day, and by the last day of work 100 more parts than planned were produced. find how many parts the company made and how many days this took.
Options: a. 600, b. 500, c. 575, d. 655, e. 675

Ex Output:
e


Ex Input:
Problem: dropbox charges $ 3.10 for first 1 / 5 of a month for 500 gb storage, plus $ 0.40 for each additional 1 / 5 of a month. what would dropbox charge for a data storage of 500 gb for 8 months ?
Options: a. $ 15.60, b. $ 16.00, c. $ 17.80, d. $ 18.70, e. $ 19.10

Ex Output:
d


Ex Input:
Problem: 3 friends had dinner at a restaurant. when the bill was received, akshitha paid 3 / 4 as much as veena paid and veena paid 1 / 2 as much as lasya paid. what fraction of the bill did veena pay ?
Options: a. 4 / 15, b. 3 / 12, c. 3 / 11, d. 3 / 10, e. 3 / 14

Ex Output:

a