Points \(B,P,Q\) lie in that order on a straight horizontal line. A vertical tower \(BT\) stands at \(B\). From ground level at \(P\) and \(Q\), the angles of elevation of \(T\) are \(50^\circ\) and \(32^\circ\), respectively. \(PQ=20\) m.
Calculate the height of the tower, correct to 3 significant figures.[4]
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