Task: Question Answering
Input (English): Question: John paid a sum of money for purchasing 30 pens, which he recovered in full when he sold 20 of them. What was his percentage of profit or loss per pen?

 Option A: 50%

 Option B: 60%

 Option C: 40%

 Option D: 30%

 Option E: 45%
Output (English): Option A