The angle of elevation of the top of a building from a certain point is \( 30^{\circ} \). If the...

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The angle of elevation of the top of a building from a certain point is \( 30^{\circ} \). If the observer moves 20 metres towards the building, the angle of elevation of the top increases by \( 15^{\circ} \). Find the height of the building.
a. \( 10(\sqrt{3}+1) \)
b. \( 5 \sqrt{3}-1 \)
c. \( 5(\sqrt{3}+1) \)
d. \( 10 \sqrt{3}-1 \)
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