The total industrial output value of a township this year is 5 million yuan, 25% more than last year. How much was the total industrial output value last year?
某乡今年的工业总产值500万元，比去年多25%，去年的工业总产值是多少万元？
<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">500 / (5/4)</gadget>
<output>400</output>

<result>400</result>