Task: Question Answering
Input (English): Question: The difference between C.I. and S.I. on an amount of $20,000 for 2 years is $72. What is the rate of interest per annum?

 Option A: 5%

 Option B: 6%

 Option C: 7%

 Option D: 8%

 Option E: 9%
Output (English): Option B