The actual output value of a certain factory last year was 1 million yuan, and the actual output value increased by 25% compared with the plan. How much is a factory's planned output value last year?
某厂去年实际产值是100万元，实际比计划增加产值25%．某厂去年计划产值多少万元？
<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">100 / (5/4)</gadget>
<output>80</output>

<result>80</result>