Estimate the default premium and the maturity premium given the following three investment opportunities: A Treasury bill

Question:

Estimate the default premium and the premium given the following three investment opportunities: A Treasury bill with a current interest rate of 3.5%, a Treasury bond with a twenty year with a current interest rate of 5.5%, a AAA twenty year corporate bond with an interest rate of 7.0%?
Maturity
Maturity is the date on which the life of a transaction or financial instrument ends, after which it must either be renewed, or it will cease to exist. The term is commonly used for deposits, foreign exchange spot, and forward transactions, interest...