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: a company produces 50000 bottles of water everyday. if a case can hold 25 bottles of water. how many cases are required by the company to hold its one day production
Options: a. 2000, b. 4500, c. 5000, d. 8000, e. 9000
[EX A]: a

[EX Q]: Problem: a 270 metres long bullet train running at the speed of 120 kmph crosses another bullet train running in opposite direction at the speed of 80 kmph in 9 seconds. what is the length of the other bullet train ?
Options: a. 226, b. 230, c. 430, d. 310, e. 260
[EX A]: b

[EX Q]: Problem: john ' s bank ' s saving amount is decreased 20 % due to loan payment and current balance is rs. 24000. find the actual balance before deduction ?
Options: a. 8000, b. 8500, c. 9000, d. 9500, e. 30000
[EX A]:
e