Question

find the cost of digging a cuboidal pit feet 8 metre long 6 metre broad and 3 metre deep at rupees 30 per metre square

Answer 1

Given cuboid dimensions 
Length = 8m
Breadth = 6m and
Height = 3m
Rate per m² = Rs30
Total cost = Total surface area × 30
⇒2(lb + bh + hl) ×30
⇒2[(8×6) + (6×3) + (3×8)] ×30
⇒2(48+18+ 24) ×30
⇒2(90)×30
⇒180×30
∴Rs5400 is the total cost to dig the pit

Answer 2

Answer:Rs. 4320

Step-by-step explanation:

Here, l=8m, b=6m & h=3m

Volume of the cubiodal pit

=(lbh)

=(8*6*3) cubic meter

=144 cubic meter

Cost of digging 1 cubic meter =Rs. 30

Cost of digging 144 cubic meter =Rs. (144*30)=Rs. 4320