Install tiles in a cuboid reservoir with a length of 30 meters, a width of 10 meters, and a depth of 2.2 meters. The tiles are squares with a side length of 0.2 meters. How many tiles are needed to finish this reservoir?
在一个长30米，宽10米，深2.2米的长方体蓄水池里面贴瓷砖，瓷砖是边长是为0.2米的正方形，贴完这个蓄水池至少需要多少块瓷砖？
<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">30 * 2.2 * 2</gadget>
<output>132</output>

<gadget id="calculator">10 * 2.2 * 2</gadget>
<output>44</output>

<gadget id="calculator">300 + 132 + 44</gadget>
<output>476</output>

<gadget id="calculator">0.2 * 0.2</gadget>
<output>0.04</output>

<gadget id="calculator">476 / 0.04</gadget>
<output>11_900</output>

<result>11_900</result>