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Percentage change

Percentage change. If a quantity goes through a change (increase or a decrease), we can work out the % change E.g. I bought a second hand Toyota Corolla liftback for $6500. 3 years later I sold it for $5000. Did I make a loss or a profit? What was the percentage loss?.

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Percentage change

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  1. Percentage change • If a quantity goes through a change (increase or a decrease), we can work out the % change • E.g. I bought a second hand Toyota Corolla liftback for $6500. 3 years later I sold it for $5000. Did I make a loss or a profit? • What was the percentage loss?

  2. Cost Price, Selling Price, Profit and Loss. • E.g. Rhonda bought a parachute for $90. She sold it for $320. What was her profit? Express this profit as a % of the cost. • 320 – 90 = $230 = Profit • %Profit = = 256% • E.g. Dino’s Dogfood Co. bought a bulk amount of dog biscuits for $885. They repackaged the biscuits, resulting in 60 packets in total and sold them for $13.50 a packet. Did they make a profit or a loss? Express this as a % of the cost price.

  3. $13.50 × 60 = $810 = SP • SP – CP = 810 – 885 = - $75 which means a loss of $75 • They experienced a 8.5% loss.

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