Question

The dimensions of a cuboid tin are $30cm\times 40cm\times 50cm$. Find the cost of tin required for making $20$ such tins, If the cost of tin sheet is $Rs.20$ per $sq.m$.

Answer 1

As we know that,

Surface area of cuboid $=2(lb+bh+hl)$

Therefore,

Surface area of $1$ tin box

$=2(30\times 40+40\times 50+50\times 30)=2\times (1200+2000+1500)=9400{cm}^2$

Surface area of $20$ tin box $=20\times 9400=188000{cm}^2=18.8m^2$

Given that the cost of the tin sheet is $R.20$ per square meter.

Therefore,

Cost of tin required for $20$ tin boxes $=20\times 18.8=Rs.376$