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: the lcm of two numbers is 2310 and hcf is 55. if one of the numbers is 210. then what is the other number ?
Options: a. 715, b. 825, c. 330, d. 605, e. 465
[EX A]: d

[EX Q]: Problem: 5358 x 71 = ?
Options: a. 273762, b. 283758, c. 383298, d. 273258, e. 380418
[EX A]: e

[EX Q]: Problem: how much interest will $ 10,000 earn in 9 months at an annual rate of 4 % ?
Options: a. $ 300, b. $ 350, c. $ 450, d. $ 550, e. $ 650
[EX A]:
a