The average monthly electricity consumption of the canteen is 825 kWh. After improving the equipment, only 638 kWh of electricity was used in May. According to this calculation, how much electricity can be saved in a year?
食堂每月平均用电825度，改进设备后，5月份只用电638度．按这样计算，一年可节约用电多少度？
<gadget id="calculator">825 - 638</gadget>
<output>187</output>

<gadget id="calculator">187 * 12</gadget>
<output>2_244</output>

<result>2_244</result>