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An empty fuel tank of a car was filled...

An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol present in the tank? `33. 5 %` b. `37. 5 %` c. `40 %` d. `50 %`

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