Person A has monthly taxable income of 35,000 USD. MTR is 10% if the income is between over 30,000 USD and 45,000 USD. MTR is 20% if the income is over 45,000 USD. The current ATR of A is 7%. a) Calculate the amount of tax payment? b) Calculate the tax paid if the taxable income increases to 80,000 USD. c) If the rate is total progressive tax, calculate the amount of tax payment in each case of income