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1. A coaching institute wants to execute tiling work for one of its teaching halls 60 m long and 40 m wide with a square tile of 0.4 m side. If each tile costs Rs. 5, the total cost of tiles would be :

A. Rs. 60000

B. Rs. 65000

C. Rs. 70000

D. Rs. 75000

Solution:

Number of tiles required :

\begin{aligned} = \frac{Area of hall}{Area of each tile} \\ = (\frac{60 \times 40}{0.4 \times 0.4}) \\ = 15000 \end{aligned}

∴ Total cost of tiles :
= Rs. (15000 × 5)
= Rs. 75000

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