Question

Find the cost of digging a cuboidal pit $8$ m long, $6$ m broad and $3$ m deep at the rate of $30$ per m${}^3$.

Answer 1

$l=8$ m, $b=6$ m, $h=3$ m
Volume $=l\times b\times h=(8\times 6\times 2)m^3=144$m${}^3$
Cost of digging per m${}^3$ volume $=$Rs.$30$
Cost of digging per $144$m${}^3$ volume $=$Rs.$144\times 30$
$=$ Rs. $4320$