If ₹2,500 earns a simple interest of ₹500 at a rate of 5% per annum, how long was the money invested?
4 years
Use the simple-interest relation \(SI = \dfrac{P \times R \times T}{100}\), so \(T = \dfrac{SI \times 100}{P \times R}\).
Substitute \(SI = 500\), \(P = 2500\), \(R = 5\): \(T = \dfrac{500 \times 100}{2500 \times 5} = \dfrac{50000}{12500} = 4\).
Hence, the money was invested for 4 years.
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