Hongxia Fashion Factory produced 1,200 sets of clothing in February, and 1,500 sets in March. How many percent was the increase in March compared to February?
红霞时装厂二月份生产服装1200套，三月份生产1500套，三月份比二月份增产了百分之几？
<gadget id="calculator">1_500 - 1_200</gadget>
<output>300</output>

<gadget id="calculator">300 / 1_200</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>