A bookstore actually sold 4,500 books in August, 900 more than planned. By what percentage did the actual sales exceed the plan?
某书店八月份实际销售图书4500册，比计划销售量多900册，实际销售量超过计划百分之几？
<gadget id="calculator">4_500 - 900</gadget>
<output>3_600</output>

<gadget id="calculator">900 / 3_600</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>