A 8-meter-long, 6-meter-wide, and 3-meter-high classroom is stuccoed, with doors and windows covering an area of 10.5 square meters. 0.8 kg of lime is needed per square meter, how many kg of lime is needed to paint this classroom?
一间长8米，宽6米，高3米的教窒粉刷，门窗面积10.5平方米．每平方米需用石灰0.8千克，粉刷这个教室需多少千克石灰？
<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 - 10.5</gadget>
<output>73.5</output>

<gadget id="calculator">48 + 73.5</gadget>
<output>121.5</output>

<gadget id="calculator">121.5 * 0.8</gadget>
<output>97.2</output>

<result>97.2</result>