classroom with a length of 10 meters, a width of 8 meters, and a height of 3.5 meters is plastered. After deducting the area of the doors, windows and blackboards of 9.8 square meters, how many square meters is the plastered area?
长10米，宽8米，高3.5米的教室，抹上石灰，扣除门窗黑板面积9.8平方米，抹石灰的面积有多少平方米？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">10 * 3.5</gadget>
<output>35</output>

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

<gadget id="calculator">35 + 28</gadget>
<output>63</output>

<gadget id="calculator">63 * 2</gadget>
<output>126</output>

<gadget id="calculator">126 - 9.8</gadget>
<output>116.2</output>

<gadget id="calculator">80 + 116.2</gadget>
<output>196.2</output>

<result>196.2</result>