show work using excel please

3. Firm C's bonds have a face value of $1,000 and are currently sold for 78.6% of the par. The bonds have a 5.7 percent coupon rate. What is the current yield on these bonds? 4. Firm D's zero-coupon bonds have a market price of $432.87, a face value of $1,000, and a yield to maturity of 7.26 percent. How many years is it until these bonds mature? (Hint: use semiannual in your calculation.)