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: last year a worker saved 4 % of her annual salary. this year, she made 10 % more money than last year and she saved 5 % of her salary. the amount she saved this year was what percent of the amount she saved last year ?
Options: a. 137.5 %, b. 142.5 %, c. 147.5 %, d. 152.5 %, e. 157.5 %
Output:
a