$1.$ Corporate bonds issued by Johnson Healthcare currently yield $8$ percent.

A$1$: If an investor is in the $34$ percent tax bracket, what is the after$-$tax rate on corporate bond $($Write your answer as a decimal. For example, write $\mathrm{.}1234$ instead of $12\mathrm{.}34\%.)$

MY ANSWER $=0\mathrm{.}0528$

B$1.$ Municipal bonds of equal risk currently yield $6$ percent. At what tax rate would an investor be indifferent between these two bonds? $($write your answer as a decimal$)$

MY ASWER $0\mathrm{.}25$

C$1.$ What is the rate on the bond that an investor in the $34$ percent tax bracket should invest in$?$ PLEASE HELP SOLVE $1$C$.$

I calculated $0\mathrm{.}08,0\mathrm{.}12$ & $1$ which were wrong. Please provide a breakdown of the answer.