Company A's total sales in 2020 is 900 million won, operating expenses are 600 million won, rent is 60 million won, The depreciation amount is 50 million won. At the end of 2020, the residual value of the machine is 40 million won.

1) On December 31, 2020, this machine was sold for 80 million won. Profit from disposal after tax

How much?

2) What is the total tax this company will pay?

3) What is marginal tax rate?

4) What is the effective tax rate?

5) On December 31, 2020, this machine was sold for 20 million won. How much Net loss on disposal after tax

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