Explanation

Let's use the simple interest formula: Simple Interest (SI) = (Principal x Rate x Time)/100 Given: Principal (P) = Rs 450 SI = Rs 81 Rate (R) = 4.5% per annum We need to find Time (T). Rearranging the formula 81 = (450 * 4.5 *T) / 100 Multiply both sides by 100: 8100 = 450 * 4.5 * T 8100 = 2025 * T Divide both sides by 2025: T = 8100/2025 T = 4 The correct answer is: (C) 4 years