The power consumption of Happiness School in October is 1200 kWh, which is one-fifth less than that in September. How much is the power consumption of Happiness School in September?
幸福学校十月份的用电量是1200度，比九月份节省五分之一，幸福学校九月份的用电量是多少度？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1_200 / (4/5)</gadget>
<output>1_500</output>

<result>1_500</result>