14.-17. The records of a domestic corporation, on the calendar year basis, organized in 2010, show financial data for the following years: 2018 2019 2020 2021 Net Sales 3,925,000 4,810,000 5,939,000 6,945,000 Cost of sales 1,950,000 2,710,000 3,465,000 4,180,000 Business expenses including bad debts written off 1,900,000 2,000,000 2,520,000 2,400,000 Other taxable income Total assets 25,000 40,000,000 100,000 50,000,000 26,000 51,000,000 35,000. 49,000,000 Recovery of bad debts written off: In 2018 60,000 In 2019 10,000 The income tax payable for 2018, 2019, 2020, 2021?