Answer:
Here, l = 4.5 m, b = 3 m, h = 350 cm = 3.5 m. Total surface area of room (cuboid) \[=2\left[ lb+bh+hl \right]\] \[=2\left[ 4.5\times 3+3\times 3.5\times +3.5\times 4.5 \right]\] \[=2\left[ 13.5+10.5+15.75 \right]\] \[=2\left[ 39.75 \right]\] \[\,=79.5\text{ }{{m}^{2}}\] Required area for plastering = 79.5 - Area of base (surface) = 79.5 - 13.5 = 66 \[{{m}^{2}}\] Cost of plastering \[=66\times 8\] = Rs. 528
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