Preston Corporation has a bond outstanding with an annual interest payment of $80, a market price of $1,230, and a maturity date in 10 years. Assume the par value of the bond is $1,000 What is the coupon rate, current yield, approximate yield to maturity, and exact yield to maturity (Use the approximation formula to compute the approximate yield to maturity and use the calculator method to compute the exact yield to maturity. Do not round intermediate calculations. Input your answers as a percent rounded to 2 decimal places.)