Tianzhu fast food restaurant planned to use 400 tons of water in April, but actually used 350 tons of water. What percentage was saved?
天祝快餐店四月份计划用水400吨，实际用水350吨，节约了百分之几？
<gadget id="calculator">400 - 350</gadget>
<output>50</output>

<gadget id="calculator">50 / 400</gadget>
<output>1/8 = around 0.125</output>

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