Min is a resident citizen, earning purely business income for the taxable year 2023: Gross sales 2,800,000 Cost of sales 1,200,000 Operating expenses Creditable withholding taxes Required: 1. Calculate the income tax payable after creditable withholding taxes. 650,000 80,000 2. Calculate the income tax payable assuming Min opted to be taxed using 8% optional income tax rate.