A stock has an expected return of $5\mathrm{.}7\%,$ and its Sharpe ratio is $0\mathrm{.}6.$ If the risk$-$free rate is $2\mathrm{.}1\%,$ what is the stock's standard deviation?

Enter your answer as a percentage, rounded to $2$ decimals, and without the percent sign $(\text{'}\%\text{'}).$ For example, if your answer is $0\mathrm{.}01789,$ enter $1\mathrm{.}79.$