A cuboidal oil tin is `30\ c m` by `40\ c m` by `50\ c mdot` Find the cost of the tin required for making `20\ ` such tines if the cost of tin sheet is `R s .20` per square metre.

Explanation

A cuboidal oil tin is 30 cm by 40cm by 50 cm

total surface area of A cuboidal oil tin`=2(lb+bh+hl)`

`=2(50xx40+40xx30+30xx50)`

`=9400 cm^2`

so area in metre^2`=0.94m^2`

so total cost for making 20 such tin`=0.94xx20xx20`

`=376 rupees`