The cook in the school canteen reported to the director of general affairs: "Our canteen used 32 tons of water this month, which is 8 tons less water than last month." What percentage did the canteen save this month?
学校食堂的炊事员向总务主任汇报说："我们食堂这个月用去32吨，比上个月少用水8吨"请问这个食堂本月节约了百分之几？
<gadget id="calculator">32 + 8</gadget>
<output>40</output>

<gadget id="calculator">8 / 40</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>