The leather shoe factory produced 27,500 pairs of leather shoes last year, an increase of 10% from the original plan. How many pairs of leather shoes were originally planned to be produced last year?
皮鞋厂去年生产皮鞋27500双，比原计划增产10%，去年原计划生产皮鞋多少双？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">27_500 / (11/10)</gadget>
<output>25_000</output>

<result>25_000</result>