Baota Village's breeding income this year is 8.4 million yuan, which is 40% more than last year's breeding income. How much was the farming income of the whole village last year?
宝塔村今年养殖业收入840万元，比去年养殖收入增加四成，去年全村养殖收人多少万元？
<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">840 / (7/5)</gadget>
<output>600</output>

<result>600</result>