You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[EX Q]: Question: an article with cost price of 180 is sold at 15% profit. what is the selling price?

 Option A: 198

 Option B: 200

 Option C: 204

 Option D: 207

 Option E: 210
[EX A]: Option D

[EX Q]: Question: find two integers, neither of which ends in a zero, and whose product is exactly 10,000

 Option A: 64 and 15,625

 Option B: 60 and 15,625

 Option C: 64 and 15,620

 Option D: 16 and 625

 Option E: 64 and 16,625
[EX A]: Option D

[EX Q]: Question: If the sides of a triangle are 30 cm, 40 cm and 50 cm, what is its area?

 Option A: 400

 Option B: 500

 Option C: 550

 Option D: 600

 Option E: 700
[EX A]:
Option D