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.
--------
Question: Question: The original price of a shirt was $20. It was decreased to $15 . What is the percent decrease of the price of this shirt.

 Option A: 25%

 Option B: 35%

 Option C: 45%

 Option D: 55%

 Option E: 65%

Answer: Option A


Question: Question: How much more would Rs.20000 fetch, after two years, if it is put at 20% p.a. compound interest payable half yearly than if is put at 20% p.a. compound interest payable yearly?

 Option A: 482

 Option B: 297

 Option C: 278

 Option D: 298

 Option E: 279

Answer: Option A


Question: Question: The average age of three boys is 12 years and their ages are in the proportion 2 : 6 : 8. The age of the youngest boy is:

 Option A: 21 years

 Option B: 8.75 years

 Option C: 6.75 years

 Option D: 9 years

 Option E: None of these

Answer:
Option C