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: michelle deposited a certain sum of money in a savings account on july 1 st, 2007. she earns an 14 % interest compounded semiannually. the sum of money in the account on december 31 st, 2009 is approximately what percent of the initial deposit ?
Options: a. 117 %, b. 120 %, c. 121 %, d. 138 %, e. 145 %

Ex Output:
d


Ex Input:
Problem: find the cost of fencing around a circular field of diameter 32 m at the rate of rs. 2 a meter ?
Options: a. 201, b. 132, c. 772, d. 592, e. 261

Ex Output:
a


Ex Input:
Problem: the income tax in country x is 8 % of any income up to $ 5000. for incomes over $ 5000, an 8 % tax is imposed on the first $ 5000, and a 10 % tax is imposed on the portion of the total income in excess of $ 5000. if perry paid $ 950 in income tax last month, then what was perry ' s income ?
Options: a. $ 10500, b. $ 11000, c. $ 13000, d. $ 13500, e. $ 14,000

Ex Output:

a