Hope Primary School builds a rectangular playground with a length of 80m and a width of 50m. First, a layer of 8cm-thick concrete should be laid, and then cinders should be laid. How many cubic meters of triad soil are needed? (1 square = 1 cubic meter)
希望小学修一个长80m、宽50m的长方形操场，先要铺一层8cm厚的三合土，再铺煤渣．需要三合土多少方？(1方=1立方米)
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">80 * 50 * (2/25)</gadget>
<output>320</output>

<result>320</result>