Xinhua Tractor Factory produced 3,600 tractors last year, an increase (1/4) compared to the plan. How many tractors did it plan to produce last year?
新华拖拉机厂去年生产拖拉机3600台，比计划增产(1/4)，去年计划生产拖拉机多少台？
<gadget id="calculator">1 / 4</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">3_600 / (5/4)</gadget>
<output>2_880</output>

<result>2_880</result>