Question

The area of a playground is 3650 $m^2.$ Find the cost of covering it with gravel up to $1.2$ cm deep when the gravel costs Rs. $6.40$ per cubic metre. (Round your answer to the nearest whole number)

Answer 1

Volume of the gravel $=$ Area of the playground $\times$ depth

$=3650m^2\times 1.2cm=3650m^2\times 0.012m=43.8m^3$
Cost of covering the playground with the gravel at Rs $6.40$ per cubic metre

$=43.8\times 6.40=Rs280.32$

Nearest whole number to $280.32$ is $280$.