Answer:
Stephen is at -23 feet below the ground level.
Explanation:
Height of each story in a hotel is given as
feet or 11.5 feet.
Hotel has 2 underground levels having same height of each level.
Total height of underground levels = 2 × 11.5 = 23 feet
Since ground level of the hotel is assumed to be at 0 feet.
Below this level all elevations will be with negative notation.
Therefore, Stephen will be working at the elevation = 0 - 23 = -23 feet