**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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