You read in The Wall Street Journal that $30-$day T$-$bills are currently yielding $5\mathrm{.}8\%.$ Your brother$-$in$-$law, a broker at Safe and Sound Securities, has given you the following estimates of current interest rate premiums:

Inflation premium$=3\mathrm{.}25\%$

Liquidity premium$=0\mathrm{.}6\%$

Maturity risk premium$=1\mathrm{.}85\%$

Default risk premium$=2\mathrm{.}15\%$

On the basis of these data, what is the real risk$-$free rate of return?