The bookstore planned to donate 600 books to the Hope Project, but they donated 720 books. What percentage exceeded?
书店计划为希望工程捐书600本，结果捐了720本，超过百分之几？
<gadget id="calculator">720 - 600</gadget>
<output>120</output>

<gadget id="calculator">120 / 600</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>