Stock	P0	Q0	P1	Q1	P2	Q2
A	90	100	95	100	95	100
B	50	200	45	200	45	200
C	100	200	110	200	55	400

a. Calculate the rate of return on a price-weighted index of the three stocks for the first period (t = 0 to t = 1).

b. What must happen to the divisor for the price-weighted index in year 2?

c. Calculate the rate of return for the second period (t = 1 to t = 2).