Verified answer

Length l=12m

Breadth b=9m

Height h=4m

⇒ Total surface of the tank =2(l×b+b×h+h×l)

=2(12×9+9×4+4×12)

=2×(108+36+48)

=192×2

=384m²

[tex]⇒ Length \: of \: the \: sheet \: required = \frac{384}{2} [/tex]

[tex] = 192m[/tex]

∴ Cost of the sheet =192×5

=960

∴ Total cost of the sheet =Rs.960.

Hence, the answer is 960.

Step-by-step explanation:

hi

how are you?

good morning