1. **Stating the problem:** Given a principal amount of 50000, find the amount after applying an interest rate of 15%. 2. **Formula used:** The formula for calculating simple interest is: $$\text{Interest} = \frac{P \times R \times T}{100}$$ where $P$ is the principal, $R$ is the rate of interest, and $T$ is the time period. 3. **Assuming time period:** Since the time period is not given, we assume $T=1$ year. 4. **Calculating interest:** $$\text{Interest} = \frac{50000 \times 15 \times 1}{100} = 7500$$ 5. **Calculating total amount:** $$\text{Amount} = \text{Principal} + \text{Interest} = 50000 + 7500 = 57500$$ 6. **Explanation:** We calculated the interest for one year at 15% rate on 50000, which is 7500. Adding this interest to the principal gives the total amount after one year. **Final answer:** $$\boxed{57500}$$