The power consumption of an a-watt light bulb for t hours is ((at)/1000) degrees. If the average electricity consumption is 4 hours a day, how many degrees of electricity will be shared by two 25-watt light bulbs for a month (calculated on the basis of 30 days).
一个a瓦的电灯泡t小时的用电量是((at)/1000)度，如果平均每天用电4小时，那么2个25瓦的灯泡一个月(按30天计算)共用电多少度．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

<gadget id="calculator">(1/10) * 2 * 30</gadget>
<output>6</output>

<result>6</result>