$4.$ 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 $($IP$)=3\mathrm{.}25\%$

$$ Liquidity Premium $($LP$)=0\mathrm{.}6\%$

$$ Maturity Risk Premium $($MRP$)=1\mathrm{.}85\%$

$$ Default Risk Premium $($DRP$)=2\mathrm{.}15\%$

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

Please show your work.