A classroom is 10 meters long, 8 meters wide, and 2.5 meters high. The ceiling and four walls of the classroom need to be painted. The area excluding doors, windows and blackboards is 35.6 square meters. If an average of 0.2 kilograms of paint is used per square meter, how many kilograms of paint are needed in total?
一间教室长10米，宽8米，高2.5米，要粉刷教室的天花板和四面墙壁，除去门窗和黑板的面积35.6平方米，如果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">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">10 * 2.5 * 2</gadget>
<output>50</output>

<gadget id="calculator">8 * 2.5 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 - 35.6</gadget>
<output>4.4</output>

<gadget id="calculator">80 + 50 + 4.4</gadget>
<output>134.4</output>

<gadget id="calculator">134.4 * 0.2</gadget>
<output>26.88</output>

<result>26.88</result>