A certain sum amounts to Rs.12,672 after 4 years and to Rs.15,744 after 8 years at the same rate percent p.a. at simple interest. The simple interest on the same sum at 10% p.a. for \(3\dfrac{1}{3}\) years will be∶

• A. Rs.3,350
• B. Rs.3,000
• C. Rs.3,240
• D. Rs.3,200