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The diameter of a roller 120cm long is 84cm. If it takes 500 complete revolutions to level a playground, determine the cost of levelling it at the rate of 30 paise per square metre.

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The diameter of a roller 120cm long is 84cm. If it take 500 complete revolutions to level a playground,determine the cost of levelling it at the rate of 30 paise per square metre.

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