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Suppose the interest rate is 5%, the income tax rate 35%, the tax rate on investment income is 20%, and the investment horizon 40 years. (a) What is the final payoff after tax if $100 pre-tax income is invested in a regular savings account? (b) What is the final payoff after tax if $100 pre-tax income is invested in a retirement account? (c) What is the final payoff after tax if $100 pre-tax income is invested in a Roth account? Suppose the interest rate is 5%, the income tax rate 35%, the tax rate on investment income is 20%, and the investment horizon 40 years. (a) What is the final payoff after tax if $100 pre-tax income is invested in a regular savings account? (b) What is the final payoff after tax if $100 pre-tax income is invested in a retirement account? (c) What is the final payoff after tax if $100 pre-tax income is invested in a Roth account