There are 2 bonds in the portfolio. Their current prices, interest rates, and durations are listed below. What is the change in the portfolio value due to a 1% drop in the interest rate?

Bond	A	B
Market price	900	1,100
Interest rate	7%	5%
Duration (year)	6	4

Select one:

a. $92.54

b. $86.01

c. $89.54

d. $95.88

e. $83.21