A classroom is 12m long, 8m wide, and 3m high. The walls and ceiling of the classroom need to be painted, and the area of doors, windows, and blackboards is 28.4 square meters. The average amount of paint used per square meter is 0.2 kg. How many kg of paint is needed in total?
一间教室长12m，宽8m，高3m，要粉刷教室的四壁和天花板，出去门窗和黑板的面积28.4㎡，平均每平方米用涂料0.2千克，一共需要涂料多少千克？
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

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

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">96 + 24 + 36</gadget>
<output>156</output>

<gadget id="calculator">156 * 2</gadget>
<output>312</output>

<gadget id="calculator">312 - 96 - 28.4</gadget>
<output>187.6</output>

<gadget id="calculator">187.6 * 0.2</gadget>
<output>37.52</output>

<result>37.52</result>