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The total gallons of water used in the park after the new ride is installed can be calculated as follows:
Initial total gallons of water used = 8.1 * 10^7 gallons
Additional gallons of water from new ride = 54,000 gallons
Total gallons of water after new ride = 8.1 * 10^7 + 54,000
Total gallons of water after new ride = 8.1 * 10^7 + 5.4 * 10^4
Total gallons of water after new ride = 8.1 * 10^7 + 0.54 * 10^5
Total gallons of water after new ride = 8.1 * 10^7 + 5.4 * 10^5
Total gallons of water after new ride = 8.155 * 10^7
Therefore, the total gallons of water used in the water park after the new ride is installed is 8.155 * 10^7 gallons.