A sum of RS 3200 become RS 3456 in two years at a certain rate of simple interest. What is the rate of interest per annum? Share with your friends Share 0 Shrutina Agarwal answered this Dear Student, Interest = Amount - Principal = Rs 3456 - 3200 = Rs 256 R = SI × 100P × t = 256 × 1003200×2 = 4% pa Regards, 1 View Full Answer