The dimensions of a hall is 10 m × 9 m ×8 m. Find the cost of white washing the walls and ceiling at the rate of Rs 8.50 per square metre.

The dimensions of a hall is 10 m $\times$ 9 m $\times$ 8 m. Find the cost of white washing the walls and ceiling at the rate of Rs 8.50 per square metre.

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