The printing factory bound a batch of books. It was originally planned to bind 500 books per day, and the task was completed in 30 days; the task was actually completed in only 25 days. How many books were actually bound every day? (Solve using arithmetic method and ratio method)
印刷厂装订一批图书，原计划每天装订500本，30天完成；实际只用了25天就完成了任务，实际每天装订多少本？(用算术法和比例方法解答)
<gadget id="calculator">30 / 25</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">500 * (6/5)</gadget>
<output>600</output>

<result>600</result>