Q 3040167013.     A window in a building is at a height of `10` m from the ground. The angle of depression of a point P on the ground from the window is ` 30^{\circ}`. The angle of elevation of the top of the building from the point `P` is ` 60^{\circ}`. Find the height of the building.

A

`30 m`

B

`80 m`

C

`100 m`

D

`50 m`

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