The maturity risk premium $($MRP$)$ is determined from the formula: $0\mathrm{.}1(t-1)\%,$ where $t$ is the security$\text{'}$s maturity. The liquidity premium $($LP$)$ on all Nationial Transmissions Corp.s bonds is $1\mathrm{.}05\%.$ The following table shows the current relationship between bond ratings and default risk premiums $($DRP$)$:

$\backslash$table$[[$Rating$,$Default Risk Premium$],[$U$.$S$.$ Treasury,$-],[$AMA$,0\mathrm{.}60\%$