If household appliances such as televisions and air conditioners are not unplugged after use, they will also consume electricity and cause waste. According to estimates, the TV consumes 0.008 kilowatts of electricity per hour in the standby state, and the air conditioner consumes 0.02 kilowatts of electricity per hour. If the plugs of these two electrical appliances are never pulled out, and the standby time is calculated as 10 hours a day, how many kilowatts of electricity will be wasted in a month?
如果电视机、空调等家用电器在使用后不拔掉电源插头，也会消耗电能，造成浪费．据测算，电视机在待机状态每小时耗电0.008千瓦，空调机每小时耗电0.02千瓦．如果这两样电器的插头从来不拔，每天待机时间按10小时计算，一个月要浪费多少千瓦电量？
<gadget id="calculator">0.008 + 0.02</gadget>
<output>0.028</output>

<gadget id="calculator">0.028 * 10 * 30</gadget>
<output>8.4</output>

<result>8.4</result>