Consider a two-year bond with a face value of $1,000, an annual coupon of $80, and a market price of $950. Suppose the one-year spot interest rate is 6.5%. Then, the two-year spot interest rate, expressed in percentage per annum is _____.

Suppose the market price for a eight-year pure discount bond with a face value of $1,000 is $500. What is the sopt interest rate for the five-year maturity expressed in percentage per annum?