1) The volume of petrol used by a car every day a) Fixed value b) Changeable value 2) Zarina's age in the next two years. a) Fixed value b) Changeable value 3) The monthly electricity bill of Puan Aini's household. a) Fixed value b) Changeable value 4) The distance between Saiful's house and his school. a) Fixed value b) Changeable value

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