The dimensions of an oil tin are `26 c m\ x\ 26 c m\ x\ 45 c mdot` Find the area of the tin sheet required for making 20 such tins. If 1 square metre of the tin sheet costs Rs. 10, find the cost of tin sheet used for these 20 tines.

Explanation

Given
Dimensions`=26xx26xx45`
Total surface area of tin=`2(lb+bh+hl)`
`=2(26xx26+26xx45+45xx26)`
`=2(676+1170+1170)`
`=2(3016)`
`=6032cm`
Area of sheet required`=6032xx20`
`=120640cm^2`
Now cost of tin required to make such tines`=frac{120640 xx10}{100xx100} = `rs` 120.64`