The output value of a certain factory in June was 1.4 million yuan, which was 200,000 yuan more than 80% in May. How much was the output value of this factory in May? (column equation solution)
某工厂六月份产值是140万元，比五月份的80%多20万元，这个厂五月份产值是多少万元？(列方程解答)
<result>150</result>