The original planned turnover of the supermarket in December was 5 million yuan, but the actual turnover was 5.5 million yuan. By what percentage?
超市十二月份原计划营业额500万元，实际营业额为550万元．增加了百分之几？
<gadget id="calculator">550 - 500</gadget>
<output>50</output>

<gadget id="calculator">50 / 500</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>