Answer :
Let total height is g, Incomplete Tower Height is DB.
Given Angle of Elevation of the top is 60o, Angle of Elevation of the Incomplete Tower is 30o. AB = 120.
in 
ABD,
(rationalization)
DB = 40√3
in 
BAC,
BC = 120√3
Increase in Height To change the angle of Elevation = 120√3 – 40√3 = 80√3
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