6.7 – Percent and Problem Solving: InterestSimple Interest:

Simple Interest .Principal= Interest Rate

Total Amount +Principal= Interest

Principal: $600.00 Interest Rate: 4%

Interest = $600.00 . 0.04

Interest = $24.00

= 0.04

Total Amount = $600.00 + $24.00

Total Amount = $624.00

. Time

Time = 1 year

61.25

Simple Interest

875.00 + 306.257%1181.25

Find the simple interest and the total amount paid on a five year loan of $875 at a rate of 7%.

Total Amount

.$875

875 . 0.07

$306.25

$1181.25

6.7 – Percent and Problem Solving: Interest6.7 – Percent and Problem Solving: Interest

. 5

. 5

. 5

306.25

Simple Interest

1500.00 + 225.0020%1725.00

A student borrowed $1500 for nine months on a credit card. The interest on the credit card is 20%. How much interest was paid and what was the total amount?

Total Amount

.$1500

225.00

$1725.00

6.7 – Percent and Problem Solving: Interest

. 9/12

0.2.$1500 . 0.75

300 . 0.75

$225.00

Simple Interest

2100.00 + 136.5013%2236.50

If $2100 is invested at a simple interest rate of 13% for six months, what is the value of the investment at the end of the six month period?

Total Amount

.$2100

136.50

$2236.50

6.7 – Percent and Problem Solving: Interest

. 6/12

0.13.$2100 . 0.5

273 . 0.5

$136.50

7.1 – Reading Pictographs and Bar Graphs

Pictograph: A graph that uses symbols to represent the data.

Key or Legend: Explains the meaning of the symbol used in the pictograph.

How many people ordered cheese pizza? 

What kind of pizza had the most orders? 

What 2 kinds of pizza had the same number of orders? 

7.1 – Reading Pictographs and Bar Graphs

25 

pepperoni 

cheese and sausage 

7.1 – Reading Pictographs and Bar Graphs

What is the second most popular apple in the store? 

How many Golden Delicious apples are carried by the store? 

Jonathan 

25

7.1 – Reading Pictographs and Bar Graphs

Bar Graph: A graph that uses vertical or horizontal bars to represent data. Each bar requires a label to identify it.

Scale: A horizontal or vertical number line used to read the data from the bar graph.

7.1 – Reading Pictographs and Bar Graphs

How many students watch 12–14 hours of TV?  How many watch 6-8 hours? What range is the largest and how many students watch? 

30 

22

9-11 hours with 32 students

7.2 – Reading And Drawing Circle GraphsCircle Graph: A graph that uses a circle to represent the data as a whole.

Each sector (pie piece) shows a category and its relative size to the other categories.

45%

15%

20% 2.5%

15%

2.5%

The most common data presentation is as a percent.

7.2 – Reading And Drawing Circle GraphsCircle Graph: A graph that uses a circle to represent the data as a whole.

Each sector (pie piece) shows a category and its relative size to the other categories.

Another presentation is to show the data for each category.

90

30

40

30

55

7.2 – Reading And Drawing Circle GraphsIf percentages are used, there is no way to calculate the numerical size of each category without a sample size.

A Family's Weekly Expenditure: Mortgage, Food and Fuel

Expense $ Fraction Degrees Percent

Mortgage 300

Food 225

Fuel 75

600300

81600

75

83600

225

21

3602

1 x 3602 x 180x

3608

1 x 3608 x 45x

3608

3 x 10808 x 135x

180

13545

%1002

1 2

%100%50

%1008

1 8

%100%5.12

%1008

3 8

%300%5.37

%50

%5.37%5.12

7.2 – Reading And Drawing Circle Graphs

A Family's Weekly Expenditure:Mortgage, Food and Fuel

Expense $ Fraction Degrees Percent

Mortgage 300

Food 225

Fuel 75

600300

81600

75

83600

225

21

180

13545

%50

%5.37%5.12

7.2 – Reading And Drawing Circle Graphs

A Family's Weekly Expenditure:Mortgage, Food and Fuel

Expense $ Fraction Degrees Percent

Mortgage 300

Food 225

Fuel 75

600300

81600

75

83600

225

21

180

13545

%50

%5.37%5.12

7.2 – Reading And Drawing Circle Graphs