A sum of ₹12,500 amounts to ₹15,500 in 4 years at the rate of simple interest. What is the rate of interest?

साधारण ब्याज = 15500 - 12500 = ₹3000। दर = (SI * 100) / (P * T) = (3000 * 100) / (12500 * 4) = 300000 / 50000 = 6%।