A tower standing on a horizontal plane subtends a certain angle at a point 80 m apart from the foot of the tower. On advancing 50 m towards it, the tower is found to subtend an angle twice as before. Find the height of the tower?

A tower standing on a horizontal plane subtends a certain angle at a point 80 m apart from the foot of the tower. On advancing 50 m towards it, the tower is found to subtend an angle twice as before. Find the height of the tower?
1). 30 m
2). 40 m
3). 60 m
4). 50 m

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