For a chemical raw material, the original production cost per ton was 1250 yuan, but now the cost has been reduced by 20%. How much is the cost per ton now?
一种化工原料，原来每吨生产成本是1250元，现在成本降低了20%．现在每吨成本是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_250 * (4/5)</gadget>
<output>1_000</output>

<result>1_000</result>