Aunt Li pays 50 yuan for electricity in September and 45 yuan for electricity in October. What percentage of the electricity fee paid in October is that of September?
李阿姨九月份付电费50元，十月份付电费45元，十月份付的电费是九月份的百分之几？
<gadget id="calculator">45 / 50</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>