Consider the following sequence of events:

\(\hspace{2mm}\) 1. Start with a full gasoline tank.

\(\hspace{2mm}\) 2. Use half the gas.

\(\hspace{2mm}\) 3. Re-fill the tank with gasoline until it's full.

\(\hspace{2mm}\) 4. Use a quarter of the gas.

\(\hspace{2mm}\) 5. Re-fill the tank with gasoline until it's full.

What percentage of the gas in the tank after step (5) was originally there in step (1)?

**Note:** Assume perfect mixing between steps. Enter your answer as a percentage. For example, 58.4% would be entered as 58.4.

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