The simple interest on a sum equals 1/10 of itself in 4 years. Then the rate of interest will beA2 1/2%B1 1/2%C2 3/4%D3 1/4%Answer: A. 2 1/2%Read Explanation:n = 4 Principal =P Interest =P/10 PNR /100 =1 (PX4XR)/100 =P/10 R=2 1/2%Open explanation in App