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 = $600.00 . 0.04 Interest = $24.00 Total Amount = Principal + Interest Total Amount = $600.00 + $24.00 Total Amount = $624.00

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% 5 875.00 + 306.25 . . 875 1181.25 0.07 5 . . $1181.25 61.25 5 . 306.25 $306.25

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 1500.00 + 225.00 . . 1725.00 $1500 0.2 0.75 . . $1725.00 300 0.75 . 225.00 $225.00

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 2100.00 + 136.50 . . 2236.50 $2100 0.13 0.5 . . $2236.50 273 0.5 . 136.50 $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.

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 

7.1 – 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

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?  30  How many watch 6-8 hours?  22 What range is the largest and how many students watch?  9-11 hours with 32 students

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%

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

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.

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

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

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