1.

The area of a playground is `3650 m^2`.Find the cost of covering it with the gravel 1.2 cm deep, if the gravel costs rs 6.40 per cubic metre

Answer» Volume of the ground covered with gravel `V =` Area of ground * depth of gravel
`V = 3650**1.2/100 = 43.8 m^3`
Now, cost of gravel in rupees ` = 6.40` per `m^3`
`:.` Cost of covering ground with gravel `= 43.8**6.40 = 280.32` Rs


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