6. There is a 10-year, 10% semiannual coupon, $1,000 par value bond is selling for $1,135.90 with an 8% yield to maturity. If the bond is called after 4 years at $1,050, whats the required rate of return?

. There is a 2-year par=$100 bond with 8% coupon. The annual yield is 7.5%. What's the duration and modified duration of this bond?