The turnover of the computer store in October was 4.8 million yuan, an increase of 20% compared with that in September. How much is the turnover in September?
电脑专卖店十月份的营业额是480万元，比九月份增加了20%，九月份的营业额是多少万元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">480 / (6/5)</gadget>
<output>400</output>

<result>400</result>