The TV factory completed the plan (3/8) in the first half of the month, and produced 2100 sets in the second half of the month. The actual output is 25% higher than the plan. How many units do you plan to produce this month?
电视机厂上半月完成计划的(3/8)，下半月生产了2100台．实际产量比计划增产25%．这个月计划生产多少台？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/4) - (3/8)</gadget>
<output>-1/8 = around -0.125</output>

<gadget id="calculator">1 + (-1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">2_100 / (7/8)</gadget>
<output>2_400</output>

<result>2_400</result>