. The cost of petrol rises by 2 cents a liter. last week a man bought 20 liters at the old price. This week he bought 10 liters at the new price. Altogether, petrol costs $9.20. What was the old price for 1 liter?
2 answers:
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Answer $0.90 is the old price for 1 litre. Solution step by step Given N as New price O as Old price 10 = $9.20 new price 1 = x new price Cross multiply $9.20x = 10N $9.20x/10 = 10N/10 $0.92 = 1N $0.92 per litre To find Old price $0.92 - 2 cents Old price for 1 litre = $0.90 20 litre = $0.90(20) 20 litre = $18
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