A living room is 6 meters long, 4.2 meters wide, and 3 meters high. Now to paste wallpaper on the four walls, the price of wallpaper is 3.5 yuan per square meter, how much will it cost after deducting the area of doors and windows of 12m**2?
一间客厅的长6米，宽4.2米，高3米．现在要在四壁贴墙纸，每平方米墙纸售价3.5元，扣除门窗面积12m**2，需要花多少元钱？
<gadget id="calculator">4.2 * 6</gadget>
<output>25.2</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">4.2 * 3</gadget>
<output>12.6</output>

<gadget id="calculator">18 + 12.6</gadget>
<output>30.6</output>

<gadget id="calculator">30.6 * 2</gadget>
<output>61.2</output>

<gadget id="calculator">61.2 - 12</gadget>
<output>49.2</output>

<gadget id="calculator">25.2 + 49.2</gadget>
<output>74.4</output>

<gadget id="calculator">74.4 * 3.5</gadget>
<output>260.4</output>

<result>260.4</result>