You read in The Wall Street Journal that $30-$day T$-$bills are currently yielding $4\mathrm{.}0\%.$ Your brother$-$in$-$law, a broker at Safe and Sound Securities, has given you the following estimates of current interest rate premiums:

Inflation premium $=2\mathrm{.}75\%$

Liquidity premium $=0\mathrm{.}3\%$

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

Default risk premium $=2\mathrm{.}90\%$