We know that 1cm= 0.01m
Given that area of courtyard is 3750 m2
Volume of the gravel = area × height
V = 3750 × 0.01 = 37.5 m3
Also given that the cost of covering it with gravel to a height of 1cm if the gravel costs
₹ 6.40 per cubic meter.
There the cost is 37.5 × 6.40 = ₹ 240