The length of a swimming pool is 20 meters, the width is 10 meters, and the depth is 2 meters. If tiles are pasted around and on the bottom of the swimming pool, what is the area of the tiles in square meters?
一个游泳池的长是20米，宽10米，深2米，给它的四周和底面贴上瓷砖，贴瓷砖的面积是多少平方米．
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">2 * 20</gadget>
<output>40</output>

<gadget id="calculator">200 + 20 + 40</gadget>
<output>260</output>

<gadget id="calculator">260 * 2</gadget>
<output>520</output>

<gadget id="calculator">520 - 200</gadget>
<output>320</output>

<result>320</result>