Wall painting

The wall is 4 meters wide and 2 meters high. The window in the wall has dimensions of 2x1,8 meters. How many liters of color is needed to paint two-layer these walls, if the 1 m² needs 1 liters of paint?

Correct result:

x =  8.8 l

Solution:

$x=2\cdot 1\cdot (4\cdot 2-2\cdot 1.8)={\displaystyle \frac{44}{5}}\text{ l}=8.8\text{ l}$

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