Transcript Percent of Change SOL 8.3(b) A percent of change is a ratio

Percent of Change
SOL 8.3(b)
A percent of change is a ratio
that compares the change in
quantity to the original amount.
Percent of Change
Remember a ratio can be written as
a fraction!
amount of change x 100 = % of
original amount
change
Problem # 1
Zack Cole shot an 86 on the
golf course on Monday. On Friday
he shot a 95. What is the % of
change?
Is the score increasing or decreasing?
Answer #1
amount of change x 100
original amount
95-86 = 9 = 0.10465(100) =
86
86
10.5% Increase
Because score was going up!
Problem # 2
Kelly Dyer became a great
writer. She had a picnic each
year to celebrate the date of her
first published work. The 1st
nd
year 50 people came. The 2
year 30 people came. What is
the percent of change?
Answer #2
50-30 = 20 = 0.4(100)
50 50
40% Decrease
Because the amount of people
decreased from year 1 to year 2!
Problem # 3
Last six weeks Joseph Lawhorn
made an 88 average in class.
This six weeks he made a 92.
Please figure the percent
of change.
Answer #3
92-88 = 4 = 0.04545(100)
88
88
4.5% Increase
Because his average is going up!
Problem # 4
Angela Smyre became a
famous architect. She made
$90,000 in 2004. In 2005 she
made $120,000. What is the
percent of increase?
Answer #4
120,000- 90,000 = 30,000= .33(100)
90,000
90,000
33.3% Increase
Problem # 5
Amber Robinson became a foster
mother, because she is so good with
children. She took care of 8
children in 2003. In 2004 she had
only 5. What is the percent of
change?
Answer #5
8 - 5 = 3 = 0.375(100)
8
8
37.5% Decrease
Problem # 6
Jonathan Rogers drew 47 planes in
th
th
4 period. He drew 28 in 5
period. What is the percent
of change?
Answer #6
40.4% Decrease
Problem # 7
Matt Viers bought 42 CD’s
last year. He bought only
35 this year. (He lost all his
money in the stock market) What
is the percent of change?
Answer #7
16.7% Decrease
Problem # 8
Lisa LaViers became a
great singer. She was so famous
she had 12 body guards at one
concert. At the next concert she
had 15 body guards. What is
the percent of change?
Answer #8
25% Increase
Problem # 9
Jessica Summey and Emily Lower
were famous mud wrestlers. They
made $45,000 in 2008. In
2009 they made $60,000. What is
the percent of change?
Answer #9
33.3% Increase
Problem # 10
Brittany Berrier became a famous
doctor. She took out 15 gall
bladders on May 15th. She took out
th
30 on May 18 . What is the % of
change?
Answer #10
100% Increase