The simple interest on a sum of money is equal to the principal and number of years is equal to the rate percent per annum. Find the rate percent.A15%B20%C12%D10%Answer: D. 10% Read Explanation: Let the sum of money is equal to x. Then interest is also x I = PNR/100 x = x*N*R/100 100 = N * R, where N and R are equal ie. N=10, and R = 10Read more in App