The Nile Commercial bank is planning to sell its $90$ Day commercial paper to investors offering an $8\mathrm{.}4\%$ yield. If the three$-$month T$-$ Bill$$s annualized rate is $7\%$ the default risk premium is estimated to be $0\mathrm{.}6\%$ and there is a $0\mathrm{.}4\%$ tax adjustment.

A$)$ What is the appropriate liquidity premium?

B$)$ If due to unexpected changes in the economy the default risk premium increases to $0\mathrm{.}8\%.$ What is the appropriate yield to be offered on the commercial paper $($Assuming no other changes Occur?$)$