Question

An open water tank 12m long 9m wide and 4m deep is to be made. Determine the cost of iron sheet required at the rate of ₹25 per m square

Answer 1

the total surface area is 384 and the cost is ₹9600

Answer 2

area=LSA +l * b
=2h(l+b) + l*b
=2*4(12+9)+12*9
=8*21+108
=168+108
=276sq.m
cost=25*276
=₹6900