The output of a steel factory this year has increased by 25% compared with last year. What is the output of last year?
某钢铁厂今年的产量比去年增长25%，去年的产量是今年的多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

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

<result>4/5 = around 0.8</result>