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: 40 % of a number is added to 60, the result is the same number. find the number ?
Options: a. 300, b. 288, c. 270, d. 100, e. 281
d