1. 1) New Value = €40 Multiplier = 100 - 20 = 80%  0.8 New Value = Original Value x Multiplier 40 = OV x 0.8 40 ÷ 0.8 = OV OV = €50 Ipod was originally €50!

2. 2) New Value = €17.25 Multiplier = 100 + 15 = 115%  1.15 New Value = Original Value x Multiplier 17.25 = OV x 1.15 17.25 ÷ 1.15 = OV OV = €15 Box was originally €15!

3. 3) New Value = €98.80 Multiplier = 100 + 4 = 104%  1.04 New Value = Original Value x Multiplier 98.80 = OV x 1.04 98.80 ÷ 1.04 = OV OV = €95 Ticket price was originally €95!

4. 4) New Value = 660ml Multiplier = 100 + 10 = 110%  1.1 New Value = Original Value x Multiplier 660 = OV x 1.1 660 ÷ 1.1 = OV OV = 600ml Normal bottle contains 600ml!

5. 5) New Value = €264 Multiplier = 100 + 20 = 120%  1.2 New Value = Original Value x Multiplier 264 = OV x 1.2 264 ÷ 1.2 = OV OV = €220 Katie’s pay was €220 per week before the rise!

6. 6) New Value = 2.4m Multiplier = 100 - 4 = 96%  0.96 New Value = Original Value x Multiplier 2.4 = OV x 0.96 2.4 ÷ 0.96 = OV OV = 2.5m Ivan’s best height is 2.5m!

7. 7) New Value = 31 biscuits Multiplier = 100 + 24 = 124%  1.24 New Value = Original Value x Multiplier 31 = OV x 1.24 31 ÷ 1.24 = OV OV = 25 Before a packet had 25 biscuits!

8. 8) New Value = €66.70 Multiplier = 100 + 15 = 115%  1.15 New Value = Original Value x Multiplier 66.70 = OV x 1.15 66.70 ÷ 1.15 = OV OV = €58 Delboy buys his goods at €58!

9. 9) New Value = 90kg Multiplier = 100 - 20 = 80%  0.8 New Value = Original Value x Multiplier 90 = OV x 0.8 90 ÷ 0.8 = OV OV = 112.5kg Vanessa weighed 112.5kg!

10. 10) New Value = €8400 Multiplier = 100 - 30 = 70%  0.7 New Value = Original Value x Multiplier 8400 = OV x 0.7 8400 ÷ 0.7 = OV OV = €12000 Price of car when new was €12000!

11. L.O. Be able to work out ANY Percentage Increase/Decrease question

12. Identify the Type  Find the percentage ?  Find the new value?  Find the original value?

13. Read the Question and identify what you are given and what you must find:  GIVEN : Original Value and New Value MUST FIND : Percentage  GIVEN : Percentage and Original Value MUST FIND : New Value  GIVEN : Percentage and New Value MUST FIND : Original Value

14. Remember the method to find what you must find

15. STP 9 Exercise 4e Pg 92-93 1,3,4,6,10,12