A garment factory produced 27,600 sets of garments in September, which was 3,600 sets more than planned. How much should the increase be?
某服装厂9月份生产服装2.76万套，比计划多生产了0.36万套，求增加几分之几？
<gadget id="calculator">2.76 - 0.36</gadget>
<output>2.4</output>

<gadget id="calculator">0.36 / 2.4</gadget>
<output>0.15</output>

<result>0.15</result>