A poster is on top of a building. Rajesh is standing on the ground at a distance of 50 m from the building. The angles of elevation to the top of the poster and bottom of the poster are 45° and 30° respectively. What is the height of the poster?

• A. $\frac{{50}}{{\sqrt 3 }}\left( {\sqrt 3- 1} \right)$$
• B. $50\sqrt 3 \,{\text{m}}$$
• C. $50\sqrt 3 \,{\text{m}}$$
• D. one of these