The turnover of Xiangqun chain stores in October was 345,000 yuan, which was an increase of 45,000 yuan compared with September's turnover. How much percentage did October's turnover increase compared to September?
向群连锁店十月份的营业额是34.5万元，比九月份营业额增加了4.5万元，十月份的营业额比九月份增加了百分之几？
<gadget id="calculator">34.5 - 4.5</gadget>
<output>30</output>

<gadget id="calculator">4.5 / 30</gadget>
<output>0.15</output>

<result>0.15</result>