A sheet of white tin is 25 cm long and 4/5 wide (4/5). After removing squares of equal area from the four corners, a tin box without a cover with a depth of 5 cm is just made. What is the volume of this tin box?
一张白铁皮长25厘米，宽是长的(4/5)，在四个角上分别去掉面积相等的正方形后，正好做成一个深5厘米的无盖铁皮盒．这个铁皮盒的容积是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

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

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

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

<gadget id="calculator">15 * 10 * 5</gadget>
<output>750</output>

<result>750</result>