1. 6.7 – Percent and Problem Solving: Interest
Simple Interest:
Simple Interest =
Principal
Interest Rate
Time . .
Principal: $600.00
Interest Rate: 4%
= 0.04
Time = 1 year
Interest = $
Interest = $24.00
Total Amount =
Principal +
Interest
Total Amount = $ $24.00
Total Amount = $624.00

2. 6.7 – Percent and Problem Solving: Interest
Find the simple interest and the total amount paid on a five year loan of $875 at a rate of 7%.
Simple Interest
Total Amount
$875 7% 5 . .
875
0.07 5 . . $
61.25 5 .
306.25
$306.25

3. 6.7 – Percent and Problem Solving: Interest
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?
Simple Interest
Total Amount
$1500
20%
9/12 . .
$1500
0.2
0.75 . . $
300
0.75 .
225.00
$225.00

4. 6.7 – Percent and Problem Solving: Interest
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?
Simple Interest
Total Amount
$2100
13%
6/12 . .
$2100
0.13
0.5 . . $
273
0.5 .
136.50
$136.50

5. 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.

6. 7.1 – Reading Pictographs and Bar Graphs
How many people ordered cheese pizza? 
25 
What kind of pizza had the most orders? 
pepperoni 
What 2 kinds of pizza had the same number of orders? 
cheese and sausage 

7. 7.1 – Reading Pictographs and Bar Graphs
What is the second most popular apple in the store? 
Jonathan 
How many Golden Delicious apples are carried by the store?  25

8. 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.

9. 7.1 – Reading Pictographs and Bar Graphs
How many students watch 12–14 hours of TV? 
30 
How many watch 6-8 hours?  22
What range is the largest and how many students watch? 
9-11 hours with 32 students

10. 7.2 – Reading And Drawing Circle Graphs
Circle 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.
The most common data presentation is as a percent.
45%
20%
2.5%
2.5%
15%
15%

11. 7.2 – Reading And Drawing Circle Graphs
Circle 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 40 5 5 30 30

12. 7.2 – Reading And Drawing Circle Graphs
If percentages are used, there is no way to calculate the numerical size of each category without a sample size.

13. 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

14. 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

15. 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