Notes 9.6B
Name_________________
Example
How do I use a
percent of change?
1. Use this formula:
percent times original = decrease
or
percent times original = increase
A company sold 10 CD-Rs
per package but now sells
10% fewer. How many are
in the new package?
p% ∙ original = decrease
2. Fill in the values.
p% ∙ original = decrease
10% ∙ 10
= decrease
3. Solve .
10% ∙ 10
= decrease
.1 ∙ 10 = 1
Your turn
A taco company puts- 20
taco shells in a box. If it
puts 25% more in each box,
how many shells are in the
box now?
p% ∙ original = increase
Package has a
decrease of 1 so:
10 – 1 = 9
9 in new package
Key Vocabulary:
percent of change – how
much a quantity has
increased or decreased
compared to the original
amount
percent of increase – the
new amount is greater than
the original amount
percent of decrease – the
new amount is less than the
original amount
Remember:
Formulas for percent of change:
percent times original = decrease
or
percent times original = increase