The electricity consumption of Tongle School in October is 1200 kwh, which is 20% less than that in September. How much is the electricity consumption of Tongle School in September?
同乐学校十月份的用电量是1200度，比九月份节省20%，同乐学校九月份的用电量是多少度？
<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>

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

<result>1_500</result>