CMAT 2021 Solved Question Paper

Diameter of roller $=0.7\mathrm{m}$
Length (or height) of roller $=4\mathrm{m}$
∴ Curved surface area of roller $=2\mathrm{\pi }\mathit{r}\mathit{h}$
$=0.7\times \frac{22}{7}\times 4=8.8{\mathrm{m}}^2$
Total area covered of roller to level a road
$=8.8\times 2000=17600{\mathrm{m}}^2$
∴ Total cost of levelling the road
$=17600\times 4=\mathit{₹}70400$