1. Reverse Percentage
- In a box, 15% of the balls are green. If there are 54 green balls, find the number of balls in the box.
- In the library, the fine for not returning a book on loan is 125% of the price of the book. If the fine for a book that was not returned was $90, find the price of the book.
2. Percentage increase
- Increase = Increased_value ( End_value, or New_value) – Original_value
- Percentage increase = ( Increase/ Original_value) x 100%
- Increased_value = (100% + Increase %) x Original_value
3. Percentage decrease
- Decrease = Original_value – Decreased_value ( End_value, or New_value)
- Percentage decrease = (Decrease / Original_value) x 100%
- Decreased_value = (100% – Decrease %) x Original_value
4. Home Work:
- Handout:
- Three pages
- Workbook:
- Page 40: 8, 9, 10, 11