The school needs to paint the new classrooms. It is known that the length of the classroom is 8m, the width is 6m, the height is 3m, and the area after deducting doors and windows is 12m**2. If the paint fee is 2.5 yuan per square meter, how much will it cost to paint this classroom?
学校要粉刷新教室．已知教室的长是8m，宽是6m，高是3m，扣除门窗的面积12m**2．如果每平方米需要花2.5元涂料费，粉刷这个教室需要花费多少元？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

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

<gadget id="calculator">24 + 18</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">84 - 12</gadget>
<output>72</output>

<gadget id="calculator">48 + 72</gadget>
<output>120</output>

<gadget id="calculator">120 * 2.5</gadget>
<output>300</output>

<result>300</result>