Task: Question Answering
Input (English): Question: The ratio of cost price to the market price of an article is 4: 5. What is the profit percentage if the ratio of the profit percentage on selling the article to the discount allowed on it is 5: 4?

 Option A: 10%

 Option B: 12%

 Option C: 12.5%

 Option D: 15%

 Option E: 16%
Output (English): Option C