The turnover of a store in September this year increased by 12.5% compared with the same period last year, an increase of 400,000 yuan. How much was the turnover in September last year?
某商店今年九月份的营业额比去年同期增长12.5%，增加了40万元，去年九月份的营业额是多少万元？
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">40 / 0.125</gadget>
<output>320</output>

<result>320</result>