From the following data obtain the discount curve:

a. A zero-coupon bond maturing in half a year with a price of 98.6172

b. A coupon bond paying 7% quarterly maturing in three months with a price of 101.044.

c. A coupon bond paying 6.5% semi-annually maturing in nine months with a price of 104.343.

d. A coupon bond paying 5% semi-annually maturing in a year with a price of 102.15.