Class 51 needs to paint the classroom. The classroom is 12 meters long, 8 meters wide, and 3 meters high. The area of the door, blackboard and windows is 36 square meters. If an average of 0.4 kilograms of paint is used per square meter, how many kilograms of paint do you need to prepare in total to waste (1/10)?
五一班要粉刷教室，教室长12米，宽8米，高3米，门和黑板以及窗户的面积是36平方米．如果平均每平方米用涂料0.4千克，估计要浪费(1/10)一共需要准备多少千克涂料？
<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 - 36</gadget>
<output>180</output>

<gadget id="calculator">180 * 0.4</gadget>
<output>72</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">72 / (9/10)</gadget>
<output>80</output>

<result>80</result>