Question

$20$ cubical tin boxes each with edge $12cm$ are to be made. Find the cost of the tin sheet required at the rate of $Rs.130$ per $m^2$.

• A. $Rs.224.4$
• B. $Rs.224.64$
• C. $Rs.224.5$
• D. $Rs.223.4$

Answer 1

The correct option is B $Rs.224.64$

20 cubic tin boxes surface area$=20\left(6\right)\left({12}^2\right)=17280c{m}^2$
$1m=100cm$
$17280c{m}^2=1.728m^2$
Tin sheet required at the rate of $Rs.130per{m}^2=\left(130\right)\left(1.728\right)=Rs.224.64$