please show all written work, explanation, and equations

4. (10 points). Schnusenberg Corporation has a bond outstanding with 15 years to maturity, an 8.25% nominal coupon, semiannual payments, and a $1,000 par value. The bond has a 6.50% nominal yield to maturity, but it can be called in 6 years at a price of $1,045. What is the bond's nominal yield to call