Question:
The area of a courtyard is 3750 m2. Find the cost of covering it with gravel to a height of 1 cm if the gravel costs Rs 6.40 per cubic metre.
Solution:
$1 \mathrm{~cm}=0.01 \mathrm{~m}$
Volume of the gravel used $=$ Area $\times H$ eight $=(3750 \times 0.01)=37.5 \mathrm{~m}^{3}$
Cost of the gravel is Rs $6.40$ per cubic meter.
$\therefore$ Total cost $=(37.5 \times 6.4)=$ Rs 240
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