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2. 10 40 50 40 In 1996 a can of coke cost 40p and in 2004 50p. What is the percentage increase? Fractional increase = Actual increase Original amount = – 40 = = Percentage increase = 1 4

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4. Over the last decade the level of unemployment in this borough, fell from 13000 to 11000. Calculate the percentage decrease. CHECK 2000 13000 Fractional decrease = Actual decrease Original amount = – 11000 = = 2 13 Percentage decrease =

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6. The table below shows the price of a litre of petrol 42p1991 48p1990 PriceYear 74p2004 86p2000 54p1997 50p1996 What is the percentage change between 1990 and 1996? 50 – 48 48 x 100 ≈ 4.17% increase What is the percentage change between 1991 and 2000? 86 – 42 42 x 100 ≈ 105% increase What is the percentage change between 2000 and 2004? 86 – 74 86 x 100 ≈ 13.95% decrease

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8. } Percentage Change %Change = Final Amount Starting Amount x 100 601991 481988 StaffYear 622004 682000 711996 The % change 1988 to 2000: Percentage Increase Percentage Decrease – Starting Amount 68 – 48 48 x 100 ≈ 41.7% [increase]

9. © T Madas } Percentage Change 601991 481988 StaffYear 622004 682000 711996 The % change 1996 to 2004: Percentage Increase Percentage Decrease 62 – 71 71 x 100 ≈ -12.7% [decrease] %Change = Final Amount Starting Amount x 100 – Starting Amount

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11. A flat was bought for £120000. A year later its value increased by 20%. The following year its value decreased by 12.5% What is its current value? What was its percentage increase/decrease calculated over the last 2 years? Value after 1 year: 120000x 1.2 =144000 Value after 2 years: 144000x 0.875 = 126000 [ 120000 x 1.2 x 0.875 = 126000 ]

12. © T Madas Value after 1 year: 120000x 1.2 =144000 Value after 2 years: 144000x 0.875 = 126000 120000 % increase = – 120000 x 100 Fractional increase A flat was bought for £120000. A year later its value increased by 20%. The following year its value decreased by 12.5% What is its current value? What was its percentage increase/decrease calculated over the last 2 years?

13. © T Madas Value after 1 year: 120000x 1.2 =144000 Value after 2 years: 144000x 0.875 = 126000 120000 % increase = – 120000 x 100 6000 120000 = x 100 60 12 = = 5% A flat was bought for £120000. A year later its value increased by 20%. The following year its value decreased by 12.5% What is its current value? What was its percentage increase/decrease calculated over the last 2 years?

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15. A certain brand of corn flakes is sold in boxes that weigh 375 grams. A promotional pack of 450 grams is to be produced in order to boost sales. This is indicated by a sticker on the box that states: … % extra for free. What percentage do you get for free according to the sticker? standard size: promotional size: increase: 375 450 75 Fractional increase = Actual increase Original amount = 75 375 = 0.2 Percentage increase = 20% 1 5 =

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17. 1.60 Actual decrease Original amount The exchange rate between Sterling and Euros in 2002 was: £1 = €1.60 The value of sterling has now decreased from €1.60 to €1.52 Calculate the percentage decrease. Initial rate: Final rate: % decrease = – 1.52 x 100 Fractional increase 1.60 1.52 % decrease = x 100 = 0.08 1.60 = 8 160 = 1 20 = 5%

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