Suppose that a bond portfolio is made up

four different bonds: Bond A with a

market value of 30million, Bond B with a

market value of 20million, Bond C with

a market value of 15million and Bond D

with a market value of 20million. If the

duration of the bonds are: Bond A= 4,

Bond B =7, BondC=6,and Bond D=2,

what is the duration of the four-bond

portfolio? Select one:

a.4.5

b.4.6

c.5.4

d.6.0