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.

[EX Q]: Problem: a store reported total sales of $ 460 million for february of this year. if the total sales for the same month last year was $ 320 million, approximately what was the percent increase in sales ?
Options: a. 2 %, b. 17 %, c. 44 %, d. 65 %, e. 83 %
[EX A]: c

[EX Q]: Problem: if the sides of a triangle are 26 cm, 24 cm and 15 cm, what is its area ?
Options: a. 120, b. 772, c. 180, d. 266, e. 2848
[EX A]: c

[EX Q]: Problem: the value of 3.6 x 0.48 x 2.50 / 0.12 x 0.09 x 0.5 is
Options: a. 80, b. 800, c. 8000, d. 80000, e. none of these
[EX A]:
b