Suppose that your marginal tax rate is $20\%.$ Your after$-$tax return from holding $($to maturity$)$ a one$-$year corporate bond with a yield to maturity of $15\%$ is $12\%.($Round your response to the nearest whole number$).$

Suppose your marginal income tax rate is $35\%.$ If a corporate bond pays $20\%,$ then the interest rate that an otherwise identical municipal bond have to pay in order for you to be indifferent between holding the corporate bond and the municipal bond is $\%.($Round your response to the nearest whole number$).$