The school shared 900 kWh of electricity in December this year, saving 100 kWh of electricity compared to the original plan. How much was the saving?
学校今年12月份共用电900度，比原计划节约用电100度，节约了百分之几？
<gadget id="calculator">100 + 900</gadget>
<output>1_000</output>

<gadget id="calculator">100 / 1_000</gadget>
<output>1/10 = around 0.1</output>

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