1. **Problem Statement:** Calculate the simple interest for 50,000 taka at 9% annual interest rate for 1 year and 1 month. 2. **Formula for Simple Interest:** $$\text{Simple Interest} = P \times r \times t$$ where $P$ is the principal amount, $r$ is the annual interest rate (in decimal), and $t$ is the time in years. 3. **Calculate interest for 1 year:** $$50,000 \times 0.09 \times 1 = 4,500$$ 4. **Calculate interest for 1 month:** $$50,000 \times 0.09 \times \frac{1}{12} = 375$$ 5. **Total interest:** $$4,500 + 375 = 4,875$$ **Final answer:** The total simple interest is **4,875 taka**.