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: ramu bought an old car for rs. 42000. he spent rs. 15000 on repairs and sold it for rs. 64900. what is his profit percent ?
Options: a. 13.8, b. 77, c. 18, d. 99, e. 88
Solution:
a