Suppose a bond with a $1,250 face value and a 12% coupon rate with semiannual coupons, has 25 years to maturity and is selling for $2,490.85. What is the yield to maturity?

What is the price of a bond with a $1,000 face value, 7.5% coupons (annual payments), and 6 years to maturity if the yield is 4%?

What is the price of a bond with a $1,000 face value, 5% coupons (semiannual payments), and 8 years to maturity if the yield is 6%?