Suppose there is a simple index of two stocks - stock a and stock b. stock a
opens on monday with 5000 shares at $4.50 per share. stock b opens on
monday with 2500 shares at $7.25 per share. stock a opens on tuesday at
$5.10 per share, and stock b opens on tuesday at $7.45 per share. both
stocks have the same number of shares that they opened with on monday.
what is the rate of change of this simple index over 1 day?
a. -8.6%
b. 7.5%
c. -7.5%
d. 8.6%