Xiaolan reads a storybook. She plans to read 16 pages a day, but actually reads 20 pages a day. By what percentage does the actual reading exceed the plan?
小兰读一本故事书，计划每天读16页，实际每天读20页，实际每天读的超出计划的百分之几？
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

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