1. Drill #35
3. A dripping faucet wastes 3 cups of water every 24 hours. How much water is wasted in a week?

2. Drill #35
2-7 Practice, #1 – 4

3. Drill #36 Find the missing value: 1. New: $45 2. New: $300
Original: $ Original: $200
% Change: ? % Change: ?
3. New: ? New: 100 people
Original: $ Original: ?
% Increase: 40% % Decrease: 20%

4. 2-7 Percent of Change
Objective: To find the percents of increase and decrease and to solve problems involving percent of change.
Open books to page 111.

5. Percent of Change*
The ratio of the increase or decrease of something to the original amount
Amount of change = r Percent of change
Original Amount 100
Percent of change = Amount of change x Original Amount

6. Percent of Increase*
The ratio of the increase of something to the original amount
Amount of increase = New Amount – Original Amount
Amount of increase = r Percent of increase
Original Amount 100
Percent of increase = Amount of increase x Original Amount

7. Percent of Decrease*
The ratio of the decrease of something to the original amount
Amount of Decrease = Original amount – New Amount
Amount of decrease = r Percent of decrease
Original Amount 100
Percent of decrease = Amount of decrease x Original Amount

8. Find Percent of Change*
State whether each percent of change is an increase or decrease, then find each percent of change.
Ex1.
a. Original: $25 b. Original: 30
New: $28 New: 12
1A: Original: 66 1B. Original: 9.8
New: 30 New: 12.1

9. Jamal Lewis
In 2003 Jamal Lewis rushed for 2066 yards and scored 14 touchdowns. In 2004 he rushed for 1003 yards and scored 7 touchdowns. What was his percent of decrease for yards and touchdowns?

10. Sales Tax* Method 1: Tax + Price
1. Find tax amount (multiply tax percent * sales price)
2. Add tax amount to the sale price
Method 2: Find total price
1. Add 100% to tax amount and multiply sales price

11. Sales Tax* Example 3: Concert ticket $45 + 6.25% tax
3A: DVD: $ % tax
Classwork:
2-7 Practice #10, 11, 12

12. Discounts* Method 1: Find the discount amount
% discount (Original price) = discount amount
Find the discount price
Original price – discount amount = Discount Price
Method 2: Find the Discount Price
1. Subtract discount from 100% and Multiply by Original Price
(100% - discount %) (Original price) = Discount Price

13. Discount* Example 4: Sweater $38 + 35% Discount
3A: Picture $ % Discount
Classwork:
2-7 Practice #16, 17, 18

14. Discount + Sales Tax* Method 1: 1. Find the discount price
2. Find the price with tax using the discount price
Method 2:
1. Find the tax and discount in one step
Example: 2-7 Practice #22

15. Classwork* Discount, Tax, and Discount with Tax Pg 114: #29 – 34
Do with Drill # 35