A factory uses 800 tons of water in September and 700 tons of water in October. By what percentage is water saved in October compared to September? (answer in two ways)
某工厂九月份用水800吨，十月份用水700吨．十月份比九月份节约用水百分之几？(用两种方法解答)
<gadget id="calculator">800 - 700</gadget>
<output>100</output>

<gadget id="calculator">100 / 800</gadget>
<output>1/8 = around 0.125</output>

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