A simple index of three stocks have opening values on day 1 and day 8 as
shown in the table below.
Day 1
No. shares
Price per
Day 8
No. shares Price per
share
8000
$3.90
5000
$2.50
2000
$6.10
Stock ABC
Stock XYZ
Stock QRS
share
$4.25
$2.90
$6.40
8000
5000
2000
What is the rate of change of this simple index over one week? Round your
answer to the nearest tenth.
A. -8.4%
OB. 7.7%
Ο Ο Ο Ο
C.-7.7%
D. 8.4%