There were 300 stalls before the farmer's market was expanded, and 120 stalls were added after the expansion. After the expansion, how many percent has the booth increased compared to before the expansion?
农贸市场扩建前有摊位300个，扩建后增加了120个摊位．扩建后摊位比扩建前增加了百分之几？
<gadget id="calculator">120 / 300</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>