A cuboid swimming pool is 30 meters long, 25 meters wide and 2 meters deep. The four walls and the bottom of the pool are veneered with tiles with a side length of 2 decimeters. How many tiles are needed?
一个长方体游泳池，长30米，宽25米，深2米．池的四壁和底面用边长2分米的瓷砖贴面，需要瓷砖多少块？
<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">750 + 50 + 60</gadget>
<output>860</output>

<gadget id="calculator">860 * 2</gadget>
<output>1_720</output>

<gadget id="calculator">1_720 - 750</gadget>
<output>970</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/5)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">970 / (1/25)</gadget>
<output>24_250</output>

<result>24_250</result>