Test Wednesday!

Study!

Study!

Study!

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

Describe the shaded region as a fraction, decimal and percent.

38 = X100 100

X=38% 38 = .38100

Describe the shaded region as a fraction, decimal and percent.

Fraction:______

Decimal:______

Percent: ______

*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

1.) 20% of 50

2.) 25% of 60

*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

1.) 42% of 367

2.) 34% of 55

*Remember that the “Of” number goes on the bottom. Is

ofEx. 19% of 184 19 = X100 184X=34.9619% of 184 is 34.96.

Ex 2- 32% of _____ is 57.6.

32 = 57.6100 X

32X=5,760

X=180 32% of 180 is 57.6.

1.) 25% of 16

2.) 55% of 750

3.) 64% of _____is 208.

4.) 28% of _____is 43.4

*Find the percent of a number.Tax-add it back to the original number.Discount-subtract it from the original number.

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)

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)

1.) Noa wants to buy a pair of earrings for $14.95. The earrings are discounted 10%. What is the end price?

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?

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%

1.) There are 14 people in class on Tuesday. There are 20 people in class on Wednesday. What is the percent increase?

2.) Ms. Nelson also works at Express and receives a store discount. She bought a $75 skirt for $60. What is the percent decrease?

Interest = Principal × Rate × TimeI = P × r × t

Total =Principal +InterestT=P+I

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

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.

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.