A room is 7 meters long, 5 meters wide, and 4 meters high. To paint this room, the area of doors and windows is 5.5 square meters. If you need 4 yuan paint fee per square meter. How much will it cost to paint this room?
一个房间长7米，宽5米，高4米，要粉刷这个房间，除去门窗面积5.5平方米．如果每平方米需要4元涂料费．粉刷这个房间需要花费多少钱？
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">28 + 20</gadget>
<output>48</output>

<gadget id="calculator">48 * 2</gadget>
<output>96</output>

<gadget id="calculator">96 - 5.5</gadget>
<output>90.5</output>

<gadget id="calculator">35 + 90.5</gadget>
<output>125.5</output>

<gadget id="calculator">125.5 * 4</gadget>
<output>502</output>

<result>502</result>