Suppose there is a simple index of two stocks, stock A and stock B. Stock A
opens on Monday with 8000 shares at $4.75 per share. Stock B opens on
Monday with 5000 shares at $5.12 per share. Stock A opens on Tuesday at
$5.40 per share, and stock B opens on Tuesday at $5.72 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?