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.
--------
Question: Problem: what is the normal price of an article sold at $ 72 after two successive discounts of 10 % and 20 % ?
Options: a. $ 92, b. $ 96, c. $ 100, d. $ 104, e. $ 108

Answer: c

Question: Problem: what sum of money will produce rs. 80 as simple interest in 4 years at 3 1 / 2 percent ?
Options: a. 263, b. 571.4, c. 367, d. 368, e. 339

Answer: b

Question: Problem: the sides of a square region, measured to the nearest centimeter, are 4 centimeters long. the least possible value of the actual area of the square region is
Options: a. 15.25 sq cm, b. 18.25 sq cm, c. 12.25 sq cm, d. 21.25 sq cm, e. 25.25 sq cm

Answer:
c