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: there is 60 % increase in an amount in 6 years at simple interest. what will be the compound interest of $ 12,000 after 3 years at the same rate ?
Options: a. $ 2160, b. # 3120, c. $ 3972, d. $ 6240, e. none of these
Solution:
c