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.
Q: Problem: an electrical appliances store sold this month 400 % more than the average of all the other months in the year. the sales total for this month was approximately what percent of total sales for this year ?
Options: a. 14 %, b. 21 %., c. 31 %., d. 37 %., e. 43 %.
A:
b