Multiple Choice Question: The top of the tower signal at B 2000 m away from A was sighted through a transit with recorded vertical angle of 3deg30min.

The top of the tower signal at B 2000 m away from A was sighted through a transit with recorded vertical angle of 3°30'. The height of the mast is 12 m and the HI of the transit above the point where it is set is 1.10 m with elevation 133.3 m. What is the elevation of the base of the signal B.

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