Aunt Wang’s house last used 65.4 kWh of electricity, and this month’s electricity consumption is 56.8 kWh. If each kWh of electricity is 0.5 yuan, how much money has Aunt Wang’s family saved in electricity bills this month compared to last month?
王大妈家上个用电65.4度，这个月用电56.8度，如果每度电是0.5元，那么王大妈家这个月的电费比上个月节省了多少钱？
<gadget id="calculator">65.4 - 56.8</gadget>
<output>8.6</output>

<gadget id="calculator">8.6 * 0.5</gadget>
<output>4.3</output>

<result>4.3</result>