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To calculate the elevation increase, we need to find the difference between the ending elevation and the starting elevation.
Ending elevation: 1940 feet above sea level
Starting elevation: 240 feet below sea level
To convert the starting elevation to feet above sea level, we add it to 0.
240 feet below sea level + 0 feet = -240 feet above sea level
Now we can find the elevation increase:
Elevation increase = Ending elevation - Starting elevation
Elevation increase = 1940 feet above sea level - (-240 feet above sea level)
Elevation increase = 1940 feet + 240 feet
Elevation increase = 2180 feet
Therefore, Kenji's elevation increased by 2180 feet.