A factory planned to use 5,000 kWh of electricity in October this year, but actually only used 4,500 kWh. What percentage was saved?
某工厂今年十月份计划用电5000度，实际只用了4500度，节约了百分之几？
<gadget id="calculator">5_000 - 4_500</gadget>
<output>500</output>

<gadget id="calculator">500 / 5_000</gadget>
<output>1/10 = around 0.1</output>

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