You will be paying $10, 700 a year in tuition expenses at the end of the next two years. Bonds currently yield 10%. a. What is the present value and duration of your obligation? b. What is the duration of a zero-coupon bond that would immunize your obligation and its future redemption value? c. Now suppose that rates immediately increase to 11%. What happens to your net position, that is, to the difference between the value of the bond and that of your tuition obligation? Net position changes by c. What if rates fall to 9%