A sum of ₹7,500 amounts to ₹8,400 in 2 years at simple interest. What is the rate of interest per annum?

ब्याज (SI) = 8400 - 7500 = ₹900। SI = (P x R x T) / 100 का उपयोग करते हुए: 900 = (7500 x R x 2) / 100, 900 = 150R, R = 6%।