The actual cost of a bridge is 21 million yuan, which is 3 million yuan less than the original plan. How much is the savings?
一座桥实际造价2100万元，比原计划节约了300万元，节约了百分之几？
<gadget id="calculator">2_100 + 300</gadget>
<output>2_400</output>

<gadget id="calculator">300 / 2_400</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>