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: john can complete a given task in 18 days. jane will take only 12 days to complete the same task. john and jane set out to complete the task by beginning to work together. however, jane was indisposed 6 days before the work got over. in how many days did the work get over from the time john and jane started to work on it together ?
Options: a. 11, b. 34 / 5, c. 44 / 5, d. 54 / 5, e. 12
[EX A]: d

[EX Q]: Problem: a 11 % stock yields 8 %. the market value of the stock is :
Options: a. rs. 72, b. rs. 137.50, c. rs. 112.50, d. rs. 116.50, e. none of these
[EX A]: b

[EX Q]: Problem: $ 4,000 is deposited in a savings account that pays 8 % annual interest compounded semiannually. to the nearest dollar, how much is in the account at the end of the year ?
Options: a. $ 4326.40, b. $ 4116.20, c. $ 4256.21, d. $ 4316.54, e. $ 4312.45
[EX A]:
a