1. **Stating the problem:** We need to find the monthly tax due on an amount of 60000. 2. **Understanding the problem:** The question provides four options for the tax due: 6518.4, 6618.4, 6418.4, and 6318.4. We need to determine which one is correct. 3. **Assuming a tax rate:** Since the tax rate is not given, let's assume a common tax rate to check which option fits. For example, if the tax rate is $x$, then tax due = $60000 \times x$. 4. **Checking each option:** - For 6518.4: $x = \frac{6518.4}{60000} = 0.10864$ or 10.864%. - For 6618.4: $x = \frac{6618.4}{60000} = 0.11031$ or 11.031%. - For 6418.4: $x = \frac{6418.4}{60000} = 0.10697$ or 10.697%. - For 6318.4: $x = \frac{6318.4}{60000} = 0.10531$ or 10.531%. 5. **Conclusion:** Without additional information on the tax rate or formula, we cannot definitively select the correct tax due. However, if the tax rate is approximately 10.864%, then the tax due is 6518.4. **Final answer:** The monthly tax due is 6518.4 if the tax rate is 10.864%.