Wang Li's family saved 54.6 yuan in electricity bills in the first half of the year, and Li Ming's house saved 49.8 yuan in electricity bills in the first half of the year. Which family saves more electricity bills per month on average? How much more?
王丽家上半年节约电费54.6元，李明家上半年节约电费49.8元，谁家平均每月节约的电费多？多多少元？
<gadget id="calculator">54.6 / 6</gadget>
<output>9.1</output>

<gadget id="calculator">49.8 / 6</gadget>
<output>8.3</output>

<gadget id="calculator">9.1 - 8.3</gadget>
<output>0.8</output>

<result>0.8</result>