What is the duration of a three‐year Treasury note with a coupon rate of 3 percent if the note is selling for par? What is its duration if the current yield to maturity is 10 percent? (Assume only one coupon payment per year. Treat the security as having a par value of $100.) What is the duration of a three‐year zero‐coupon security at an interest rate of 3 percent? An interest rate of 10 percent?