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%
