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In a triangular park, the adjacent side is \(90°\) base and height are 4 \(m\), and 121 \(m\), find the area and the cost of levelling the triangular park at \(₹\)13 per \(m²\).
 
The area of a triangular park is  \(m²\).
 
The total cost of levelling is \(₹\).