In $20x,$ the $10-$year Treasury rate was $4\mathrm{.}5$ percent while the average $10-$year Aas corporate bond debt carried an interest rate of $6\mathrm{.}0$ percent. What is the average default risk premium on Aas corporate bonds?

Mutiple Choice

$2\mathrm{.}25$ percent

$0\mathrm{.}75$ percent

$150$ percent

$1\mathrm{.}95$ percent