A cuboid reservoir with a length of 20 meters, a width of 8 meters, and a depth of 2.5 meters is tiled on the bottom and surrounding sides. How many square meters is the area that needs to be tiled?
在一个长是20米，宽是8米，深是2.5米的长方体蓄水池的底面和四周贴瓷砖．需要贴瓷砖的面积是多少平方米？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">20 * 2.5</gadget>
<output>50</output>

<gadget id="calculator">8 * 2.5</gadget>
<output>20</output>

<gadget id="calculator">160 + 50 + 20</gadget>
<output>230</output>

<gadget id="calculator">230 * 2</gadget>
<output>460</output>

<gadget id="calculator">460 - 160</gadget>
<output>300</output>

<result>300</result>