Xiaoming’s house used 80 degrees of electricity in October, which is 20 degrees less than the previous month. How much is the electricity saved compared with the previous month?
小明家十月份用电80度，比上月节约了20度，比上月节约了用电百分之几？
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>