Metal box

How much metal we need for the production of box with dimensions 5 dm, 30 cm and a height of 1 m?
Add 12% of the waste and folds.

Correct result:

x =  2.576 m²

Solution:

$x=1.12\cdot 2\cdot (0.5\cdot 0.3+0.5\cdot 1+1\cdot 0.5)={\displaystyle \frac{322}{125}}{\text{m}}^2=2.576{\text{m}}^2$

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