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PQR is a triangular park with PQ = PR = 200 m . A T.V. tower stands at the mid-point of QR. If the angles of elevation of the top of the tower at P, Q and R are respectively 45°, 30° and 30°, then the height of the tower (in m) is :

1. 100
2. 50
3. 3 100
4. 2 50

Correct answer: 100

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