A and B are two points on the same side of a ground, 50 metres apart. The angles of elevation of these points to the top of a tree are $$60^{\circ}$$ and $$30^{\circ}$$ respectively. What is 40% of the height of the tree (in m)?

A

$$10\sqrt{3}$$

B

$$15\sqrt{3}$$

C

$$5\sqrt{3}$$

D

$$25\sqrt{3}$$