a sum of rs. 12,500 amounts to rs. 15,500 in 4 years at the rate of simple interest. what is the rate of interest?

The rate of interest is -25%. Here's how to calculate it: Simple Interest (SI) = Amount - Principal SI = 300 - 1200 = -900 SI = (P × R × T) / 100, where: P = Principal amount (1200)
R = Rate of interest (unknown)
T = Time period (4 years) -900 = (1200 * R * 4) / 100 -900 = 48 * R R = -900 / 48 R = -18.75 Therefore, the rate of interest is -18.75%.