A taxable bond with a coupon rate of $5\mathrm{.}00\%$ has a market price of $99\mathrm{.}36\%$ of par. The bond matures in $13\mathrm{.}00$ years ans pays semi$-$annually. Assume an investor has a $31\mathrm{.}00\%$ marginal tax rate. The investor would prefer otherwise identical tax$-$exempt bond if it's yield to maturity was more than $\%$

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Answer format: Percentage Round to: $2$ decimal places $($Example: $9\mathrm{.}24\%,\%$ sign required. Will accept decimal format rounded to $4$ decimal places $($ex: $0\mathrm{.}0924))$

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