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 towel, when bleached, was found to have lost 20 % of its length and 10 % of its breadth. the percentage of decrease in area is
Options: a. 28 %, b. 30 %, c. 32 %, d. 38 %, e. 40 %
A:
a