The school plans to use 480 tons of water in May, but the actual water consumption is 420 tons. What percentage is the actual water saving compared with the plan?
学校五月份计划用水480吨，实际用水420吨，实际比计划节约用水百分之几？
<gadget id="calculator">480 - 420</gadget>
<output>60</output>

<gadget id="calculator">60 / 480</gadget>
<output>1/8 = around 0.125</output>

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