You can invest in taxable bonds that are paying a yield of $9\mathrm{.}5$ percent or a municipal bond paying a yield of $7\mathrm{.}75$ percent. Assume your marginal tax rate is $28$ percent.

a$.$ Calculate the after$-$tax rate of return on the taxable bond? $($Round your percentage answers to $2$ decimal places. $($e$.$g$.,32\mathrm{.}16))$

b$.$ Which security bond should you buy?

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