1. **State the problem:** We are given an initial investment of RM4200 on 15 January 2023, with a simple interest rate of 5% per annum. We need to find the amount of the investment on 15 April 2023 using Banker's Rule. 2. **Calculate the time period using Banker's Rule:** Banker's Rule assumes 30 days for every month and 360 days in a year. From 15 January to 15 April is exactly 3 months. Thus, time in years $t = \frac{3 \text{ months} \times 30 \text{ days/month}}{360 \text{ days/year}} = \frac{90}{360} = 0.25$ years. 3. **Calculate simple interest:** Simple interest formula is $I = P \times r \times t$ Where: - $P = 4200$ - $r = 5\% = 0.05$ - $t = 0.25$ So, $$I = 4200 \times 0.05 \times 0.25 = 52.5$$ 4. **Calculate total amount:** Amount $A = P + I = 4200 + 52.5 = 4252.5$ **Final answer:** The amount on 15 April 2023, using Banker's Rule, is RM4252.50.