A factory actually used 800 tons of water in May, saving 200 tons compared to the plan. What percentage was the saving compared to the plan?
某工厂5月份实际用水800吨，比计划节约了200吨，比计划节约了百分之几？
<gadget id="calculator">800 + 200</gadget>
<output>1_000</output>

<gadget id="calculator">200 / 1_000</gadget>
<output>1/5 = around 0.2</output>

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