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Suppose you purchase a 30-year zero-coupon bond with a yield to maturity of 6.2%. You hold the bond for five years before selling it. a. If the bond's yield to maturity is 6.2% when you sell it, what is the rate of return of your investment? b. If the bond's yield to maturity is 7.2% when you sell it, what is the rate of return of your investment? c. If the bond's yield to maturity is 5.2% when you sell it, what is the rate of return of your imvestment? d. Even if a bond has no chance of default, is your investment risk free if you plan to sell it before it matures? Explain. a. If the bond's yield to maturity is 6.2% when you sell it, what is the rate of return of your investment? The rate of return of your investment is \%. (Round to two decimal places.)