The TV factory produced 3,500 TV sets in June, 25% more than in May. How many sets did the production increase?
电视机厂6月份生产电视机3500台，比5月份增产25%，增产多少台？
<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">3_500 / (5/4)</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 * (1/4)</gadget>
<output>700</output>

<result>700</result>