A room is 6m long, 3m wide, and 2.8m high. If you paste wallpaper around the room, excluding doors and windows of 12m**2, it is known that the wallpaper is 15 yuan per square meter, how much is the supply and demand to buy wallpaper?
一个房间长6m、宽3m、高2.8m．如果在房间四周贴墙纸，除去门窗12m**2，已知每平方米墙纸15元，供需多少钱买墙纸？
<gadget id="calculator">6 * 2.8</gadget>
<output>16.8</output>

<gadget id="calculator">3 * 2.8</gadget>
<output>8.4</output>

<gadget id="calculator">16.8 + 8.4</gadget>
<output>25.2</output>

<gadget id="calculator">25.2 * 2</gadget>
<output>50.4</output>

<gadget id="calculator">50.4 - 12</gadget>
<output>38.4</output>

<gadget id="calculator">15 * 38.4</gadget>
<output>576</output>

<result>576</result>