Xiaoli's house saves 20% electricity consumption in October compared to September, and the electricity consumption in October is equivalent to that in September.
小丽家十月份比九月份节约用电20%，十月份用电量相当于九月份的多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>