An empty fuel tank of a car was filled with an ordinary type of petrol. When the tank was one-third empty,it was filled with high-speed petrol. Again,when the tank was one-third empty,it was filled with an ordinary type of petrol. Again,when the tank was one-third empty,it was filled with high-speed petrol. At this time,what was the percentage of high-speed petrol in the tank?
- A$51 \frac{23}{27} \%$
- B$48 \frac{4}{27} \%$
- C$49 \frac{4}{27} \%$
- D$50 \frac{23}{27} \%$
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