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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
Explanation:
Area to be plastered= $[2\left(l + b\right) \times h] $+ $\left(l \times b\right)$

= ${[2\left(25 + 12\right) \times 6] + \left(25 \times 12\right)}$ m2

= (444 + 300) m2

= 744 m2.
$\therefore$ Cost of plastering = Rs.$ \left(744 \times\dfrac{75}{100} \right) $= Rs. 558.
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