Task: Question Answering
Input (English): Question: A grocer purchased 20 kg of rice at the rate of 15 per kg and 30 kg of rice at the rate of 13 per kg. At what price per kg should he sell the mixture to earn 331/3% profit on the cost price?

 Option A: 28.0

 Option B: 20.0

 Option C: 18.4

 Option D: 17.4

 Option E: None of these
Output (English): Option C