Consider a portfolio that offers an expected rate of return of $6\%$ and a standard deviation of $21\%.$ T$-$bills offer a risk$-$free $4\%$ rate of return.

What is the maximum level of risk aversion for which the risky portfolio is still preferred to T$-$bills?

Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

$\backslash$table$[[$Maximum level of risk aversion must be$,$less than$]]$