A room is 10 meters long, 5 meters wide, and 2.4 meters high. If paint is to be painted on the walls and ceiling, 20 square meters of doors and windows are deducted. How many square meters does this room need to paint?
一个房间长10米，宽5米，高2.4米，要在四壁和顶棚粉刷涂料，扣除门窗面积20平方米，这个房间需要粉刷涂料的面积是多少平方米？
<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">10 * 2.4</gadget>
<output>24</output>

<gadget id="calculator">5 * 2.4</gadget>
<output>12</output>

<gadget id="calculator">24 + 12</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">72 - 20</gadget>
<output>52</output>

<gadget id="calculator">50 + 52</gadget>
<output>102</output>

<result>102</result>