The insurance company collected 280 million yuan in insurance premiums in the third quarter of this year, an increase of 40% over the same period last year. How much was the insurance premium collected in the third quarter of last year?
保险公司今年第三季度收保险费28000万元，比去年同期增长了40%，去年第三季度收保险费多少万元？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">28_000 / (7/5)</gadget>
<output>20_000</output>

<result>20_000</result>