Percent of increase describes how muchthe original amount increases.
Percent of decrease describes how muchthe original amount decreases.
Finding Percentage of Change
P
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=
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w
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Finding Percent of ChangeFinding Percent of Change
P
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C
h
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=
2
0
0
0
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–
1
9
9
9
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?
P
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=
4
2
0
–
4
0
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4
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2
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4
0
0
0
.
0
5
=
5
%
Finding Percent of IncreaseFinding Percent of Increase
P
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–
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.
4
=
4
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%
=
4
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+
1
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%
=
1
4
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%
Finding Percent of DecreaseFinding Percent of Decrease
P
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=
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P
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t
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C
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=
3
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4
–
4
2
2
4
2
2
-
2
8
4
2
2
0
.
0
6
6
=
6
.
6
%
Now You Try…Now You Try…Find the percent of change
1.Before 10: After 12
1.Before 128: After 32
+
2
0
%
+
5
0
%
-
7
5
%
…One More…One More
•You are enlarging a sketch that measures 4inches by 8 inches. You want the photocopyto measure 5 inches by 10 inches. Whatenlargement setting should you use on thephotocopier?
+
1
2
5
%
And another…And another…
•Before: 12 After: 15
•Before: 150 After: 175
•Before: 6 After: 4
•Before: $18.20 After: $16.80
Discount & MarkupDiscount & Markup
W
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.
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.
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l
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p
r
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c
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s
.
Mark UpMark Up
•A store buys a shirt at a wholesaleprice of $13.50 and sells the shirt for$24.95. What is the amount ofmarkup?
M
a
r
k
u
p
=
R
e
t
a
i
l
p
r
i
c
e
–
W
h
o
l
e
s
a
l
e
p
r
i
c
e
=
2
4
.
9
5
–
1
3
.
5
0
=
$
1
1
.
4
5
Mark UpMark Up
•A store buys a stereo at wholesaleprice for $145 . They sell the itemwith a 170% markup. How much isthe retail price?
M
a
r
k
u
p
=
P
e
r
c
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n
t
o
f
m
a
r
k
u
p
W
h
o
l
e
s
a
l
e
p
r
i
c
e
=
1
7
0
%
1
4
5
=
1
.
7
1
4
5
=
2
4
6
.
5
N
o
w
a
d
d
t
h
e
w
h
o
l
e
s
a
l
e
p
r
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c
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a
n
d
t
h
e
m
a
r
k
u
p
1
4
5
+
2
4
6
.
5
=
$
3
9
1
.
5
0
Let’s try againLet’s try again
•Find the amount of markup or discount.Then find the final cost of the item.•Find the amount of markup or discount.Then find the final cost of the item.
1. $520 surfboard; 20% discount
2. $20 concert; 125% markup
3. $95 jacket; 30% off
4. $345 TV; 80% markup.
Lesson QuizLesson Quiz
Find each percent increase or decrease to thenearest percent.
1. from 12 to 15
2. from 1625 to 1400
3. from 37 to 125
4. from 1.25 to 0.85
5. A computer game originally sold for $40 but isnow on sale for 30% off. What is the sale priceof the computer game?