Answer:
In order to determine the Macauly we must complete the following table:
period cash flow PV of Period x
cash flow PV cash flow
1 $3 $2.91 $2.91
2 $3 $2.83 $5.66
3 $3 $2.75 $8.25
4 $3 $2.67 $10.68
5 $3 $2.59 $12.95
6 $3 $2.51 $15.06
7 $3 $2.44 $17.08
8 $103 $81.31 $650.48
Total $723.07
Macauly duration = $723.07 / $87 = 8.31
Modified Macauly duration = Macauly duration / (1 + r) = 8.31 / 1.03 = 8.07