A rectangular fish tank measures 5 decimeters long and 4 decimeters wide from the inside. The water surface in this fish tank is 3 decimeters high. When changing the water in the fish tank, the water surface is 2.98 decimeters high after the fish is taken out. What is the volume of the fish? Cubic centimeters?
一个长方形鱼缸，从里面测量长5分米，宽4分米，这个鱼缸里的水面高3分米，给鱼缸换水时，把鱼捞出后，水面高2.98分米，鱼的体积是多少立方厘米？
<gadget id="calculator">3 - 2.98</gadget>
<output>0.02</output>

<gadget id="calculator">5 * 4 * 0.02</gadget>
<output>0.4</output>

<result>0.4</result>