1 Lesson 3.5.4 Circle Graphs and Percents Circle Graphs and Percents.
Ch. 7-Percents Review
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Transcript of Ch. 7-Percents Review
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Test Wednesday!
Study!
Study!
Study!
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Percent: Is a ratio in which the first term is compared to 100.
Discount: The amount to be taken off the original price.
Principal: An amount of money borrowed or loaned.
Interest: A charge for the use of money, paid by the borrower to the lender.
Simple Interest: Interest paid only on the principal
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Describe the shaded region as a fraction, decimal and percent.
38 = X100 100
X=38% 38 = .38100
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Describe the shaded region as a fraction, decimal and percent.
Fraction:______
Decimal:______
Percent: ______
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*Change the percent to a fraction that can easily be divided into the whole number.
Ex. 80% of 40 is ____.
4 × 40 = 325
10% 20% 33 1/3%
40% 50% 60% 66 2/3%
75% 80%
110
15
13
25
12
35
23
34
45
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1.) 20% of 50
2.) 25% of 60
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*Change the percent into a fraction. Then change the whole number into one that can be easily divided by the fraction.
Ex. 71% of 6270% of 60 70 × 60 = 42100
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1.) 42% of 367
2.) 34% of 55
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*Remember that the “Of” number goes on the bottom. Is
ofEx. 19% of 184 19 = X100 184X=34.9619% of 184 is 34.96.
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Ex 2- 32% of _____ is 57.6.
32 = 57.6100 X
32X=5,760
X=180 32% of 180 is 57.6.
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1.) 25% of 16
2.) 55% of 750
3.) 64% of _____is 208.
4.) 28% of _____is 43.4
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*Find the percent of a number.Tax-add it back to the original number.Discount-subtract it from the original number.
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Kyung wants to buy a skirt from Hollister for $47.50. it is discounted 20%. What is the end price of the skirt?
20% of $47.50 $47.50-9.50=$38.00
20 = X 100 47.50
100X=950 X=$9.50 (discount)
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Michael wants to buy a shirt from Zumez for $36.99. The sales tax is 5%. What is the end price?
5% of $36.99$36.99+1.85=$38.84
5 = X100 36.99
100X=184.95 X=$1.85 (Sales tax)
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1.) Noa wants to buy a pair of earrings for $14.95. The earrings are discounted 10%. What is the end price?
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2.) Ross wants to buy the new Mortal Combat video game at Gamestop for $59.99. The sales tax is 6.5%. What is the end price?
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X = Difference between two amounts
100 Original Number
Ex. Izzi wants to buy a pair of shoes that originally cost $48. The shoes are on sale and now cost $35. What is the percent decrease?
$48-35=13 X = 13100 4848X=1300 X=27.1%
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1.) There are 14 people in class on Tuesday. There are 20 people in class on Wednesday. What is the percent increase?
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2.) Ms. Nelson also works at Express and receives a store discount. She bought a $75 skirt for $60. What is the percent decrease?
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Interest = Principal × Rate × TimeI = P × r × t
Total =Principal +InterestT=P+I
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Ex. Megan borrowed $12, 000 for 1 year at a simple interest rate of 6.75% per year. Find the amount of interest and the total amount.
I=P×r×t T=P+II=12,000×.0675×1
T=$12,000+810T=$12,810
I=12,000×6.75×1 100
I=$810
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1.) Carrington invests $15,000 for 8 years at a simple interest rate of 6.75% per year. Find the amount of interest and the total amount.
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2.) Jacob invests $850 at a simple interest rate of 5.5% per year for 5 years. Find the amount of interest and the total amount.