Calculating Percent Change
The problem: Find the percent change if a
quantity changes from price 
to price 
. Round
the answer to the nearest tenth of a percent when rounding is required.
a). = $20,
= $27
b). = $1.89,
= $1.56
Recall that the percent change is given by 
,
where is the old
price and is the
new price.
For part a), the percent change is
= 
= .35
= 35%.
For part b), the percent change,
= 
= - .1746031746
= - 17.5% (to the nearest tenth).
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