classroom is 8 meters long, 6 meters wide, and 2.8 meters high. It needs to paint the surrounding walls and roof. It is known that the doors and windows are 28 square meters in total, and 20 kilograms of paint are used per square meter. How many kilograms of paint are needed in total?
一间教室长8米、宽6米、高2.8米，需要粉刷四周墙壁和房顶，已知门窗共28平方米，每平方米用涂料20千克，共需多少千克涂料？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 2.8</gadget>
<output>22.4</output>

<gadget id="calculator">6 * 2.8</gadget>
<output>16.8</output>

<gadget id="calculator">22.4 + 16.8</gadget>
<output>39.2</output>

<gadget id="calculator">39.2 * 2</gadget>
<output>78.4</output>

<gadget id="calculator">78.4 - 28</gadget>
<output>50.4</output>

<gadget id="calculator">48 + 50.4</gadget>
<output>98.4</output>

<gadget id="calculator">98.4 * 20</gadget>
<output>1_968</output>

<result>1_968</result>