1. The problem asks to find the monthly tax due on an income of P60,000. 2. To solve this, we need the tax rate or tax formula, which is not provided in the question. Assuming a tax rate or formula is given, the tax due is calculated as: $$\text{Tax Due} = \text{Income} \times \text{Tax Rate}$$ 3. Since the options are 6518.4, 6618.4, 6418.4, and 6318.4, we can check which one fits a reasonable tax rate. 4. Calculate the tax rate for each option: - For 6518.4: $\frac{6518.4}{60000} = 0.10864$ or 10.864% - For 6618.4: $\frac{6618.4}{60000} = 0.11031$ or 11.031% - For 6418.4: $\frac{6418.4}{60000} = 0.10697$ or 10.697% - For 6318.4: $\frac{6318.4}{60000} = 0.10531$ or 10.531% 5. Without the tax rate or formula, we cannot definitively select the correct answer. Please provide the tax rate or formula to proceed. Final answer: Cannot determine without tax rate or formula.