Definition: 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.
Input: Problem: the simple interest on a sum of money will be rs. 1400 after 10 years. if the principal is trebled after 5 years what will be the total interest at the end of the tenth year ?
Options: a. 2800, b. 3799, c. 1200, d. 2693, e. 1732
Output:
a