1. 7.6 Percent of Change
Objective: Students will be able to find percent of change, markup/discount, percent increases/decreases. They will also be able to use real-life situations and be able to figure out sales tax and tip.

2. Information
Percent of change: increase or decrease from original amount
Percent increase: new amount greater than old.
Percent decrease: new amount less than old.
Formula: % change
Difference
original amount

3. Find the percent increase/decrease
Original: 20
New: 25

4. Find the percent increase/decrease
Original: 150
New: 25
Original: 55
New: 143

5. Finding Increase/decrease (option 1)
Take % multiply by number
Add/subtract answer by original amount
Increase 45 by 20%
Decrease 85 by 28%

6. Finding Increase/decrease-st (option 1)
Increase 25 by 24%
Decrease 35 by 60%

7. Finding Increase/decrease (option 2)
Increase 28 by 25%
Decrease 70 by 40%
Option 2
Increase: multiply original by (100% + p%)
Decrease: multiply original by (100% - p%)

8. Finding Increase/decrease (option 2)
Increase 45 by 60%
Decrease 350 by 44%

9. Information Markup: increase in wholesale price.
Discount: decrease from original price.

10. Finding Markup
Price: $13
Markup: 120%
Bracelet: $7
Markup: 100%

11. Find Markup-st Price: $30 Markup: 125% Price: $120 Markup: 50%

12. Find Sale Price
Jeans: $42
Discount: 20%
Price: $40
Discount: 20%

13. Find Sale Price-st
Cost of going to zoo is $15 but will be discounted 20%. Find discount.
Price: $40
Discount: 25%

14. Tax, Tip
To find:
Mulitply original by %
Add to total
Find the total cost if meal was $20 with 6% tax and you leave 10% tip.

15. Tax, Tip-st
Food bill: $12
tax: 5%
Meal: $25
tax: 5%
tip: 10%

16. Wrap up
Questions/Comments
Hw: worksheet