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: a shopkeeper sold an book offering a discount of 5 % and earned a profit of 23.5 %. what would have been the percentage of profit earned if no discount was offered ?
Options: a. 140, b. 120, c. 130, d. 110, e. 150
c