A5. How many euros does it cost to paint a round support pillar with a diameter of $9 \mathrm{dm}$ and a height of $32 \mathrm{dm}$, if the price per square meter is 6 euros?
(A) 5428.67
(B) 1809.56
(C) 108.57
(D) 54.29
(E) 27.14
A5. We calculate the surface area of the stem that needs to be plated, which is the lateral surface area of the cylinder $S_{pl}=2 \pi r \cdot v=\pi d v$, where $d=2 r$. Substituting the data $S_{pl}=\pi \cdot 9 \cdot 32 \mathrm{dm}^{2}$. Then we calculate the cost of plating $C=\frac{\pi \cdot 9 \cdot 32 \cdot 6}{100}=54.29$ euros.