Please help solve equation

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ps_4_q1_working_.xlsx

Sheet1

t ct ct/(1-y*)^t ct/(1-y*)^t/p tct/(1-y*)^t/p
1 3 2.9268292683 0.0287282025 0.0287282025
2 3 2.8554431886 0.0280275146 0.0560550292
3 3 2.7857982328 0.0273439167 0.0820317501
4 103 93.3129164144 0.9159100551 3.6636402204
D= sum 3.8304552022
0.8007283618 800.7283617689
0.1992716382
7.9708655292
139.4901467618 940.2185085307
Part C
Duration of 5-year US Treasury Note (using Po = $979.59)
t ct ct/(1-y*)^t [ct/(1-y*)^t]/p t[ct/(1-y*)^t]/p
1 17.5 17.4650698603 0.0178289589 0.0178289589
2 17.5 17.4302094414 0.0177933722 0.0355867443
3 17.5 17.3954186042 0.0177578565 0.0532735694
4 17.5 17.3606972098 0.0177224116 0.0708896465
5 17.5 17.3260451195 0.0176870376 0.0884351878
6 17.5 17.2914621951 0.0176517341 0.1059104045
7 17.5 17.2569482985 0.0176165011 0.1233155076
8 17.5 17.222503292 0.0175813384 0.1406507073
9 17.5 17.1881270379 0.0175462459 0.1579162133
10 1017.5 997.3720707753 1.0181525646 10.1815256462
D 10.9753325858
Duration of 10-year US Treasury Note (using Po = $961.25)
t ct ct/(1-y*)^t [ct/(1-y*)^t]/p t[ct/(1-y*)^t]/p
1 18.75 18.3598531212 0.0190999772 0.0190999772
2 18.75 17.9778243537 0.0187025481 0.0374050962
3 18.75 17.6037447771 0.0183133886 0.0549401658
4 18.75 17.2374489862 0.0179323266 0.0717293066
5 18.75 16.8787750171 0.0175591938 0.0877959689
6 18.75 16.5275642762 0.017193825 0.10316295
7 18.75 16.18366147 0.0168360587 0.1178524112
8 18.75 15.8469145361 0.0164857368 0.1318858947
9 18.75 15.5171745763 0.0161427044 0.1452843393
10 18.75 15.1942957908 0.0158068097 0.1580680967
11 18.75 14.8781354132 0.0154779042 0.1702569462
12 18.75 14.5685536482 0.0151558425 0.1818701106
13 18.75 14.265413609 0.0148404823 0.1929262699
14 18.75 13.9685812573 0.014531684 0.2034435762
15 18.75 13.6779253438 0.0142293112 0.2134396673
16 18.75 13.3933173501 0.01393323 0.2229316802
17 18.75 13.1146314321 0.0136433097 0.2319362646
18 18.75 12.8417443644 0.013359422 0.2404695954
19 18.75 12.5745354853 0.0130814413 0.2485473854
20 1018.75 669.0001743316 0.695968972 13.9193794399
D 16.7524251421
Part F
Zero-coupon maturity YTM T Value
0.5 0.0325 1 984.0098400984
1 0.035 2 965.8977717946
1.5 0.0375 3 945.7952634961
2 0.039 4 925.6591097529