A shoe factory produced 600,000 pairs of leather shoes in the first half of last year, and 650,000 pairs in the second half of the year. The result was a 25% overproduction. How many thousand pairs of leather shoes did the shoe factory plan to produce last year?
某鞋厂去年上半年生产皮鞋60万双，下半年生产65万双，结果超产25%，这个鞋厂去年计划生产多少万双皮鞋？
<gadget id="calculator">60 + 65</gadget>
<output>125</output>

<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">125 / (5/4)</gadget>
<output>100</output>

<result>100</result>