A conference room is 15 meters wide, 8 meters wide, and 3.2 meters high. The area of the doors and windows is 30 square meters. Now the conference room needs to be covered with wallpaper on the walls of the conference room. The wallpaper is 25 yuan per square meter. How much is the minimum cost to buy wallpaper?
一个会议室是15米，宽8米，高3.2米，门窗的面积是30平方米，现在会议室要在会议室四壁贴壁纸，每平方米壁纸25元，买壁纸至少要花多少元？
<gadget id="calculator">15 * 3.2</gadget>
<output>48</output>

<gadget id="calculator">8 * 3.2</gadget>
<output>25.6</output>

<gadget id="calculator">48 + 25.6</gadget>
<output>73.6</output>

<gadget id="calculator">73.6 * 2</gadget>
<output>147.2</output>

<gadget id="calculator">147.2 - 30</gadget>
<output>117.2</output>

<gadget id="calculator">117.2 * 25</gadget>
<output>2_930</output>

<result>2_930</result>