A simple index of three stocks have opening values on day 1 and day 8 as
shown in the table below.
Stock ABC
Stock XYZ
Stock QRS
A. -2.0%
B. 1.2%
C. -1.2%
D. 2.0%
Day 1
No. shares
4000
5000
6000
Price per
share
$3.15
$4.30
$4.60
Day 8
No. shares
4000
5000
6000
Price per
share
$3.50
$3.90
$4.50
What is the rate of change of this simple index over one week? Round your
answer to the nearest tenth.