The compound interest on a certain sum for the second year is Rs. 240 more than the interest on the same sum for the first year. If the sum is Rs. 6000, then what is the simple interest at the same rate after \(2\frac{2}{5}\) years?

• A. Rs. 3000
• B. Rs. 2960
• C. Rs. 2850
• D. Rs. 2880