(9) A tank is 20m in length, 15m in breadth and 4m in depth. Find the cost of cementing its floor and the four walls at the rate of 50 per square metre.
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(9) A tank is 20m in length, 15m in breadth and 4m in depth. Find the cost of cementing its floor and the four walls at the rate of 50 per square metre.
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