Keenan Industries has a bond outstanding with 15 years to maturity, an 8.25% nominal coupon, semiannual payments, and a $1,000 per value. The bond has a 6.50% nominal yield to maturity, but it can be called in 6 years at a price of $1,120. What is the bond's nominal yield to call? a. 6.20% b. 6.53% c. 6.85% d. 7.20% e. 7.55%