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.
Input: Problem: a bowl contains equal numbers of red, orange, green, blue, and yellow candies. kaz eats all of the green candies and half of the orange ones. next, he eats half of the remaining pieces of each color. finally, he eats red and yellow candies in equal proportions until the total number of remaining candies of all colors equals 20 % of the original number. what percent of the red candies remain ?
Options: a. 5 %, b. 7.5 %, c. 10 %, d. 12.5 %, e. 15 %
Output:
d