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A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

Rs. 456
Rs. 458
Rs. 558
Rs. 568

Correct Answer: Rs. 558

Explanation:

Area to be plastered	= [2(l + b) x h] + (l x b)
	= {[2(25 + 12) x 6] + (25 x 12)} m²
	= (444 + 300) m²
	= 744 m².

∴ Cost of plastering = Rs.	❨	744 x	75	❩	= Rs. 558.
			100

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