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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

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, the petrol costs $9.20. What was the old price for 1 liter?

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