4. Bonds issued by the Crane Optical Company have a par value of $1,000, which is also the amount of principal to be paid at maturity. The bonds are currently selling for $750. They have 10 years remaining to maturity. The annual payment is $80. Compute the approximate yield to maturity based on semiannual analysis? 5. Bonds issued by the Crane Optical Company have a par value of $1,000, which is also the amount of principal to be paid at maturity. The bonds are currently selling for $850. They have 10 years remaining to maturity. The annual payment is 9 percent. Compute the approximate yield to maturity based on semiannual analysis? 6. Bonds issued by the Crane Optical Company have a par value of $1,000, which is also the amount of principal to be paid at maturity. The bonds are currently selling for $1,250. They have 20 years remaining to maturity. The annual payment is $100. Compute the approximate yield to maturity