Task: Question Answering
Input (English): Question: A sum of money lent out at S.I. amounts to a total of $520 after 2 years and to $820 after a further period of 5 years. What was the initial sum of money that was invested?

 Option A: $340

 Option B: $360

 Option C: $380

 Option D: $400

 Option E: $420
Output (English): Option D