The compound interest on a certain sum for 1 year at 8% p.a., interest compounded half - yearly is Rs. 652.80. What will be the simple interest on the same sum for \(2 \frac{1}{2}\) years at the same rate of interest ?

• A. Rs. 1,680
• B. Rs. 1,720
• C. Rs. 1,740
• D. Rs. 1,600