The garment factory produced 900 sets of garments in the first half of last year, and completed 75% of the plan in the second half of the year, so that the annual production exceeded 12.5% of the planned output. How many sets of garments did it plan to produce last year?
服装厂去年上半年生产服装900套，下半年完成计划的75%，这样全年超过计划产量的12.5%，去年计划生产服装多少套？
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">0.125 - (3/4)</gadget>
<output>-0.625</output>

<gadget id="calculator">1 + (-0.625)</gadget>
<output>0.375</output>

<gadget id="calculator">900 / 0.375</gadget>
<output>2_400</output>

<result>2_400</result>