A piece of rectangular iron sheet is 30cm long and 25cm wide. The four corners are cut off to make a square with a side length of 5cm, and then it is made into a box without a lid. What is the volume of the box without a lid?
一块长方形铁皮，长30cm，宽25厘米，四角分别切掉边长是5cm的正方形，然后做成无盖的盒子，这个无盖盒子的容积是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">20 * 15 * 5</gadget>
<output>1_500</output>

<result>1_500</result>