Do Now 2/20/14Do Now 2/20/14Take out your HW from last night.Take out your HW from last night.

6.6 Puzzle Time Practice 6.6 Puzzle Time Practice

Copy HW in your planner.Copy HW in your planner.Text p. 248, #7-16 all, 19, 20 Text p. 248, #7-16 all, 19, 20

In your notebook, put the following heading In your notebook, put the following heading on the top of a new page. Section 6.4 on the top of a new page. Section 6.4 “Percent of Change”“Percent of Change”

HomeworkHomeworkPuzzle Time 6.6Puzzle Time 6.6

1) $59.401) $59.40 2) $57.602) $57.60 3) $53.103) $53.10 4) $97.504) $97.50 5) $68.255) $68.25

6) $586) $58 7) $24.507) $24.50 8) $428) $42 9) $449) $44 10) $36 10) $36

11) $3.1211) $3.12 12) $284212) $2842 13) $11.9913) $11.99 14) $1261.2014) $1261.20 15) $73515) $735

PLEASED TO EAT YOU

“What Does A Monster Say When Introduced?”

ObjectiveObjective SWBAT solve problems involving percent of SWBAT solve problems involving percent of

changechange

If the amount goes up, it is a If the amount goes up, it is a PERCENT of INCREASE.PERCENT of INCREASE.

amount of changeamount of change original amountoriginal amount

Section 6.4 “Percent of Change”Section 6.4 “Percent of Change”

Percent of changePercent of change

x 100x 100

the amount that a number increases or decreases written as a percent

If the amount goes down, it is a If the amount goes down, it is a PERCENT of DECREASE.PERCENT of DECREASE.

Percent of change = Percent of change =

Find the percent of increase or decrease Find the percent of increase or decrease (round to the nearest tenth of (round to the nearest tenth of

a %).a %). Before: 30 Before: 30 After: 45 After: 45 Before: 115 Before: 115 After: 46 After: 46

Before: 116 After: 146 Before: 116 After: 146

50% increase 50% increase

60% decrease 60% decrease

25.9% 25.9% increase increase

Amount of changeAmount of change Original amountOriginal amount

x 100x 100

From 2010-2011 to 2011-2012 the From 2010-2011 to 2011-2012 the enrollment increased by 200, thereforeenrollment increased by 200, thereforeour answer is a percent of increase.our answer is a percent of increase.

actual changeactual changeoriginal amountoriginal amount

200200 11001100

≈ ≈0.1818180.181818

≈ ≈18.2% increase18.2% increase

The enrollment of Howell Middle School South in The enrollment of Howell Middle School South in 2010-2011 was 1100 students. In the year 2011-2012 2010-2011 was 1100 students. In the year 2011-2012 the enrollment was 1300 students.the enrollment was 1300 students.

What is the percent of increase or decrease between What is the percent of increase or decrease between the two years? the two years?

Percent of increase =

2011-2012: 13002011-2012: 1300 2010-2011: – 2010-2011: – 11001100 change: 200. change: 200.

==

From 1990 to 1991 the number of computersFrom 1990 to 1991 the number of computersused increased by 0.2 million or 200,000. used increased by 0.2 million or 200,000.

amount of changeamount of changeoriginal amountoriginal amount

0.2 million0.2 million 2 million2 million

=0.1=0.1

=10% =10% increaseincrease

There were 2.2 million computers used There were 2.2 million computers used in public schools in 1991 and 2 million in in public schools in 1991 and 2 million in 1990. Find the percent of increase.1990. Find the percent of increase.

Percent of increase = Percent of increase =

1991:1991: 2.2 million 2.2 million 1990: 1990: - 2.0 million- 2.0 million change: 0.2 million or 200,000change: 0.2 million or 200,000. .

Scenario 3:

If a customer brings an ad that shows a competitor is selling an item for less, you are permitted to match the competitor's price as long as the percent of discount is 15% or less.

a). The newest Blu-ray disc player is listed at $307.99. You notice on your way to work that the same player is for sale at another store for $298.79. Would you be allowed to match this store's price if asked? Explain.

amount of changeamount of changeoriginal amountoriginal amount

$9.20$9.20 $307.99$307.99

=0.0298711=0.0298711

≈ ≈3% 3% decreasedecrease

Percent of decrease = Percent of decrease =

Yes, you would be permitted to match the price of $298.79.

Scenario 3:If a customer brings an ad that shows a competitor is selling an item for less, you are permitted to match the competitor's price as long as the percent of discount is 15% or less. b). The store sells a wireless Internet router for $74.75. A customer has printed out a page from the Internet that shows the same router for $59.97 plus 5% shipping and handling. Can you match this price? Explain.

amount of changeamount of changeoriginal amountoriginal amount

$11.78$11.78 $74.75$74.75

=0.15759…=0.15759…

≈ ≈16% 16% decreasedecrease

Percent of decrease = Percent of decrease =

No, you would not be permitted to match the price on the Internet because the discount is greater than 15%.

=$59.97 x 5% shipping=$59.97 x 5% shipping = $62.97= $62.97

Percent ApplicationsPercent Applications

There were about 198,000 spectators at There were about 198,000 spectators at the NCAA Final Four in 1995. The number of the NCAA Final Four in 1995. The number of spectators increased by about 12% from 1995 to spectators increased by about 12% from 1995 to 2002. About how many spectators were there in 2002. About how many spectators were there in 2002? 2002?

Spectators in 2002 = Spectators in 1995 + Amount of increase

= 198,000 +

= 198,000 + 23,760

= 221,760

100

12

000,198

a

Percent ApplicationsPercent ApplicationsIn 1983, the average price of CD was In 1983, the average price of CD was

$21.50. By 2000, the average price had $21.50. By 2000, the average price had decreased by 34.8%. What was the average decreased by 34.8%. What was the average price of a CD in 2000? price of a CD in 2000?

Price in 2000 = Price in 1983 - Amount of Decrease

= $21.50 -

= $21.50 - 7.48

= $14.02

100

8.34

50.21

a

HomeworkHomeworkText p. 248, #7-16 all, 19, 20 Text p. 248, #7-16 all, 19, 20

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