Mama Wang is a self-employed person. Last month, her turnover was 50,000 yuan. She paid 2,000 yuan in taxes. If the tax is 5% of the turnover, has Mama Wang paid off the tax? If not, how much should be paid?
王妈妈是一位个体经营者，上个月她的营业额为50000元，她缴纳了2000元的税款，如果按营业额的5%缴纳税款，王妈妈是否缴清了税款？如果没有，应再缴纳多少钱？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50_000 * (1/20)</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 - 2_000</gadget>
<output>500</output>

<result>500</result>