Detailed Instructions: 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.
Problem:Problem: ravi and kavi start a business by investing a ' 2000 and a ' 72000, respectively. find the ratio of their profits at the end of year.
Options: a. 2: 36, b. 5: 36, c. 7: 36, d. 1: 36, e. 3: 36
Solution:
d