Estimate the total cost of brickwork and plastering required for a wall which is 4 m long, 3 m high and 30 cm thick if the rate of brickwork is ₹320 per m\(^3\) and that of plastering is ₹8.50 per m\(^2\).
[Note: Thickness faces are not plastered.]
DSSSB JE - 2023,
Answer: B
The volume of brickwork is \(4 \times 3 \times 0.30 = 3.6\ \text{m}^3\), which costs \(3.6 \times 320 = \) Rs 1,152. Plastering is done on the two large faces only, because the thickness faces are not plastered, so the area is \(2 \times 4 \times 3 = 24\ \text{m}^2\), which costs \(24 \times 8.50 = \) Rs 204.
\[ 1152 + 204 = 1356 \]The total is Rs 1,356. If only one face were plastered the total would be Rs 1,254, which is not among the options. The other options do not follow from these quantities.
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