Uncle Li paid 4,000 yuan in salary last month, and 4,500 yuan this month. What percentage is more paid this month than last month?
李叔叔上个月工资发了4000元，这个月发了4500元，这个月比上个月多发了百分之几？
<gadget id="calculator">4_500 - 4_000</gadget>
<output>500</output>

<gadget id="calculator">500 / 4_000</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>