A factory used 500 tons of water in July and 450 tons in August. How much water was saved in August compared to July?
某厂七月份用水500吨，八月份用水450吨，八月份比七月份节约用水百分之几？
<gadget id="calculator">500 - 450</gadget>
<output>50</output>

<gadget id="calculator">50 / 500</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>