To paint a classroom, the classroom is 8 meters long, 6 meters wide, and 3.5 meters high. The area after deducting doors, windows and blackboards is 14 square meters. It is known that a paint fee of 5 yuan is required per square meter. How much does it cost to paint a classroom?
要粉刷一间教室，教室长8米，宽6米，高3.5米，扣除门窗、黑板的面积14平方米．已知每平方米需要5元涂料费．粉刷一个教室需要多少钱？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3.5</gadget>
<output>28</output>

<gadget id="calculator">6 * 3.5</gadget>
<output>21</output>

<gadget id="calculator">28 + 21</gadget>
<output>49</output>

<gadget id="calculator">49 * 2</gadget>
<output>98</output>

<gadget id="calculator">98 - 14</gadget>
<output>84</output>

<gadget id="calculator">48 + 84</gadget>
<output>132</output>

<gadget id="calculator">132 * 5</gadget>
<output>660</output>

<result>660</result>