new modern library was built with an expenditure of 15 million yuan, which actually exceeded the plan by 3 million yuan. By what percentage did it exceed the plan?
新建了一座现代图书馆，支出1500万，实际超过计划300万，超过计划百分之几？
<gadget id="calculator">1_500 - 300</gadget>
<output>1_200</output>

<gadget id="calculator">300 / 1_200</gadget>
<output>1/4 = around 0.25</output>

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