Question

A water tank is $30$ m long, $20$ m wide and $12$ m deep. It is made up of iron sheet which is $3$ m wide. If the cost of the iron Sheet is Rs $10$ per meter, then the total cost of the iron sheet required to build the tank is

• A. Rs $6000$
• B. Rs $8000$
• C. Rs $9000$
• D. Rs $10000$

Answer 1

The correct option is B Rs $8000$

Surface area of the open tank
$=[2\times (20\times 12+30\times 12)+30\times 20]m^2$
=1800$m^2$
$\therefore$ Length of the iron sheet $=\frac{1800}{3}=600m$
Cost of the iron sheet Rs ( 600 x 10 )
Rs = 6000.