A cuboid swimming pool is 25m long, 10m wide, and 1.6m deep. Square tiles are built around the swimming pool and on the bottom of the pool. If the side length of a tile is 2dm, how many tiles of this kind are needed at least?
一个长方体游泳池长25m，宽10m，深1.6m，在游泳池的四周和池底砌正方形瓷砖．如果瓷砖的边长是2dm，那么至少需要这种瓷砖多少块？
<gadget id="calculator">40 + 16</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">112 + 40</gadget>
<output>152</output>

<gadget id="calculator">152 / 0.04</gadget>
<output>3_800</output>

<result>3_800</result>