You recently read in a financial magazine that the yield on $6-$month Treasury bills is currently $6\mathrm{.}8\%.$ Your cousin, who is a financial analyst at Trustworthy Investments, has provided you with the following estimates of current interest rate premiums:

Inflation premium: $1\mathrm{.}5\%$

Liquidity premium: $0\mathrm{.}5\%$

Maturity risk premium: $1\mathrm{.}1\%$

Default risk premium: $1\mathrm{.}5\%$

Given this information, calculate the real risk$-$free rate of return.