city implements a time-of-use meter plan, and the payment method of electricity bills is: 0.55 yuan per kWh during peak hours (8:00-21:00), and 0.35 yuan per kWh during off-peak hours (21:00-8:00 the next day). An air conditioner in Mr. Zhang’s house consumes 0.8 kWh of electricity per hour. How much is the electricity bill if it is turned on from 7:00 pm to 7:00 the next morning?
某市执行分时电表计划，电费缴费方式为：高峰时段(8：00～21：00)每千瓦时0.55元，低谷时段(21：00～次日8：00)每千瓦时0.35元．张老师家的一台空调每小时耗电0.8千瓦时，从晚上7：00开到次日早晨7：00，共需要电费多少元？
<gadget id="calculator">2 * 0.8 * 0.55</gadget>
<output>0.88</output>

<gadget id="calculator">10 * 0.8 * 0.35</gadget>
<output>2.8</output>

<gadget id="calculator">0.88 + 2.8</gadget>
<output>3.68</output>

<result>3.68</result>