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.

Input: Consider Input: Problem: the price of a certain painting increased by 30 % during the first year and decreased by 15 % during the second year. the price of the painting at the end of the 2 - year period was what percent of the original price ?
Options: a. 102 %, b. 105 %, c. 110.5 %, d. 112.5 %, e. 100 %

Output: c


Input: Consider Input: Problem: x does a work in 20 days. y does the same work in 40 days. in how many days they together will do the same work ?
Options: a. 10, b. 12, c. 20, d. 30, e. 13.33

Output: e


Input: Consider Input: Problem: the owner of a furniture shop charges his customer 25 % more than the cost price. if a customer paid rs. 1000 for a computer table, then what was the cost price of the computer table ?
Options: a. 620, b. 400, c. 45, d. 500, e. 800


Output: e