Section 3.7 percent of change (Algebra)
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Transcript of Section 3.7 percent of change (Algebra)
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1. a. What is 20% of 80?
4
b. Why is four wrong?
%
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1. a. What is 20% of 80?
1600
c. Why is one thousand six hundred wrong?
%
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1. a. Find 20% of 80.
16 or 16.00
d. Why is one fourth right?
80x .20
0016016 00%
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2. a. What is 35% of 20?
7.35
b. Why is seven and thirty-five hundredths wrong?
%
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2. a. What is 35% of 20?
700
c. Why is seven hundred wrong?
%
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2. a. Find 35% of 20.
7 or 7.00
d. Why is seven right?
20x .35
100607.00
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3. a. There is a discount of 25% off on a $60 pair of shoes. How much are the shoes?
$25
b. Why is twenty-five dollars wrong?
%
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3. a. There is a discount of 25% off on a $60 pair of shoes. How much are the shoes?
$15
c. Why is fifteen dollars wrong?
%
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3. a. There is a discount of 25% off on a $60 pair of shoes. How much are the shoes?
$45
d. Why is forty-five dollars correct?
$60x .25300
120$15.00
$60- 15$45
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4. a. A shirt cost $30 plus 7% tax. What is the total cost?
$37
b. Why is thirty-seven dollars wrong?
%
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4. a. A shirt cost $30 plus 7% tax. What is the total cost?
$2.10
c. Why is two dollars and ten cents incorrect?
%
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4. a. A shirt cost $30 plus 7% tax. What is the total cost?
$32.10
d. Why is thirty-two dollars and ten cents correct?
$30x .07
$2.10
$30.00+ 2.10$32.10
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5. a. A $300 bike is on sale. How much is the cost?
$275
b. Why is two hundred seventy-five dollars wrong?
%
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5. a. A $300 bike is on sale. How much is the cost?
$75
c. Why is seventy-five dollars wrong?
%
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5. a. A $300 bike is on sale. How much is the cost?
$225
d. Why is two hundred twenty-five dollars correct?
$300x .25150060
$75.00
$300- 75
$225
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A shirt that costs $30 last month, now costs $45. What is the percent of change?
15
c. Why is 15 incorrect?
%
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A shirt that costs $30 last month, now costs $45. What is the percent of change?
50%
Why is 1/2 correct?
$45- $30
$15
$15÷ $30
.5 = 1/2
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What is the Percent of Change?
Original: 25 New: 30
30 – 25 = 5
5 = 0.2 = 20%
25
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What is the percent of change?
1. Original: 55 New: 70
2. Original: 35 New: 13
3. Original: 58 New: 120
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IMPORTANT:
ALWAYS use the DIFFERENCE divide by the ORIGINAL to find the percent of change:
DIFFERENCE
ORIGINAL
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Remember to do your Classwork:
Page 162 # 4 – 36 even