Q: 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 mobile battery in 1 hour charges to 20 percent. how much time ( in minute. will it require more to charge to 50 percent.
Options: a. 145, b. 150, c. 175, d. 160, e. 130
A:
b