Painting

The room is long 50 meters and wide 60dm and 300 cm high. Calculate how much it will cost painting if area of windows and doors is 15% of the total area. One square meter cost 50cents.

Correct result:

x =  270.3 Eur

Solution:

$$\begin{gathered} S_1=50\cdot 6=300 \\ {S}_2=3.00\cdot 2\cdot (50+6)=336 \\ S=S_1+S_2=300+336=636 \\ k=1-15\mathrm{/}100={\displaystyle \frac{17}{20}}=0.85 \\ x=0.50\cdot k\cdot S=0.50\cdot 0.85\cdot 636={\displaystyle \frac{2703}{10}}={\displaystyle \frac{2703}{10}}\text{ Eur}=270.3\text{ Eur} \end{gathered}$$

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