A sum of ₹2,500 amounts to ₹2,900 in 2 years at a certain rate of simple interest. What is the annual rate of interest?

ब्याज = 2900 - 2500 = ₹400। सूत्र I = PRT/100 का उपयोग करते हुए: 400 = (2500 * R * 2) / 100 => 400 = 50R => R = 8%।