Using the following yield curve, calculate the Duration of:

8.25 year coupon bond paying a semiannual coupon of 4.85% annually

4.5 year floating rate coupon bond paying a semiannual coupon with a spread of 75 basis points 0.75%

7.25 year floating rate coupon bond paying a semiannual coupon with a spread of 75 basis points 0.75% . Thr coupon determined at the last reset date was 4.50% annually.

t	Z
0.25	0.9891
0.5	0.9798
0.75	0.9713
1	0.9633
1.25	0.9553
1.5	0.9473
1.75	0.9392
2	0.931
2.25	0.9227
2.5	0.9143
2.75	0.9059
3	0.8973
3.25	0.8888
3.5	0.8801
3.75	0.8714
4	0.8627
4.25	0.8538
4.5	0.845
4.75	0.8361
5	0.8272
5.25	0.8182
5.5	0.8093
5.75	0.8003
6	0.7913
6.25	0.7823
6.5	0.7733
6.75	0.7643
7	0.7554
7.25	0.7465
7.5	0.7376
7.75	0.7287
8	0.7199
8.25	0.7111
8.5	0.7024
8.75	0.6938
9	0.6852
9.25	0.6767
9.5	0.6683
9.75	0.6599
10	0.6516