Jinxing Brick Factory planned to use 400 tons of coal in the first half of the year, but actually saved 12 tons. What percentage of coal was saved in the first half of the year?
金星砖厂上半年计划用煤400吨，实际节约了12吨，上半年节约用煤百分之几？
<gadget id="calculator">12 / 400</gadget>
<output>3/100 = around 0.03</output>

<result>3/100 = around 0.03</result>