cuboid glass container is 20dm long and 15dm wide, and the depth of water in the container is 3.8dm. After putting a cube iron block with a side length of 3dm into the container, how much dm does the water level in the container rise at this time?
一个长方体玻璃容器，长20dm，宽15dm，容器中水深3.8dm．往容器中放入一个棱长3dm的正方体铁块后，这时容器中水面上升了多少dm？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">3 / 300</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">3 * 3 * (1/100)</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>