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.

[Q]: Problem: a 10000 liter tank, half - full of water is being filled from a pipe with a flow rate of 1 kiloliter every 2 minutes. at the same time, the tank is losing water from two drains at a rate of 1 kiloliter every 4 minutes and every 6 minutes. how many minutes does it take to fill the tank completely ?
Options: a. 8, b. 12, c. 18, d. 24, e. 60
[A]: e


[Q]: Problem: if an investor puts $ 700 in a savings account that earns 10 percent annual interest compounded semiannually, how much money will be in the account after one year ?
Options: a. $ 769.75, b. $ 771.75, c. $ 773.75, d. $ 775.75, e. $ 777.75
[A]: b


[Q]: Problem: a and b start a business, with a investing the total capital of rs. 10000, on the condition that b pays a interest @ 10 % per annum on his half of the capital. a is a working partner and receives rs. 1000 per month from the total profit and any profit remaining is equally shared by both of them. at the end of the year, it was found that the income of a is twice that of b. find the total profit for the year ?
Options: a. a. 59000, b. b. 37000, c. c. 48000, d. d. 59000, e. e. 67000
[A]:
b