The electricity consumption of the school in October is 15% lower than that in September. What percentage is the electricity consumption in October of September?
学校十月份用电量比九月份节约15%，十月份用电量是九月份的百分之几？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>