4. 4.1. What is meant by the cash price or dirty price of a coupon-paying bond? [10%] 4.2. In the context of Treasury bond futures, what is meant by the cheapest-to-deliver bond? [10%] 4.3.In the context of Treasury bond futures, given the most recent settlement price of the futures contract, how does the conversion factor helps to obtain the quoted price of the deliv- ered bond? [10%] 4.4. What is meant by LIBOR and Repo rate? Can these rates be used as risk-free interest rates? Discuss. [10%] 4.5. Given that Ri and R2 are zero rates for maturities T1 and T2, respectively, derive a formula for the forward rate between T and T2. Explain the derivation steps. [10%]