Plastering a rectangular tank (inside walls + bottom): A tank is 25 m long, 12 m wide, 6 m deep. Find cost of plastering its walls and bottom at Rs 0.75 per sq. m.

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Solve this multiple-choice question and choose the correct option.

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Introduction / Context:Compute interior area to be plastered (four walls + bottom) and multiply by the given rate. Given Data / Assumptions: Length L = 25 m, width W = 12 m, depth H = 6 m. Rate = Rs 0.75 per m^2. Concept / Approach:Area to plaster = bottom + all four interior walls. Step-by-Step Solution: Bottom area = L*W = 25*12 = 300 m^2.Long walls = 2*(L*H) = 2*(25*6) = 300 m^2.Short walls = 2*(W*H) = 2*(12*6) = 144 m^2.Total = 300 + 300 + 144 = 744 m^2.Cost = 744 * 0.75 = Rs 558. Verification / Alternative check:Unit-check: m^2 * Rs/m^2 ⇒ Rs — consistent. Why Other Options Are Wrong:Other totals correspond to incorrect wall counts or missing the bottom. Common Pitfalls:Including the top (open tank), or double-counting a pair of walls. Final Answer:Rs. 558

Plastering a rectangular tank (inside walls + bottom): A tank is 25 m long, 12 m wide, 6 m deep. Find cost of plastering its walls and bottom at Rs 0.75 per sq. m.

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