A laboratory is 12 meters long, 8 meters wide, and 4 meters high. To paint the ceiling and four walls of the laboratory, the area excluding doors, windows and blackboards is 30 square meters, and an average of 0.2 kilograms of lime is used per square meter. How many kilograms of lime are needed in total?
一个实验室长12米，宽8米，高4米．要粉刷实验室的天花板和四面墙壁，除去门窗和黑板的面积30平方米，平均每平方米用石灰0.2千克，一共需要石灰多少千克？
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<gadget id="calculator">96 + 32 + 48</gadget>
<output>176</output>

<gadget id="calculator">176 * 2</gadget>
<output>352</output>

<gadget id="calculator">352 - 96 - 30</gadget>
<output>226</output>

<gadget id="calculator">226 * 0.2</gadget>
<output>45.2</output>

<result>45.2</result>