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: find the curved surface area, if the radius of a cone is 35 m and slant height is 30 m ?
Options: a. 1100, b. 2200, c. 3300, d. 4400, e. 5500
[EX A]: c

[EX Q]: 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 A]: d

[EX Q]: Problem: the ages of 2 persons differ by 32 years. if 12 years ago the elder one be 6 times as old as the younger one, find the present age of elder person.
Options: a. 30, b. 48.5, c. 50.4, d. 62.6, e. 47.9
[EX A]:
c