Q4 of 94 Page 222

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.

We know that,

1cm = 0.01m


Therefore,


Volume of the gravel used = Area × Height


= 3750 × 0.01


= 37.5 m3


It is given in the question that cost of the gravel is Rs. 6.40 per cubic meter


Therefore,


Total cost of covering = (37.5 × 6.4)


= Rs. 240


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