There are 85 households in a village. After switching to solar stoves for cooking, each household can save 72 kilograms of coal per month on average. According to this calculation, how many kilograms of coal can be saved in a year?
一个村有85户，改用太阳灶做饭后，平均每户每月可节约用煤72千克．照这样计算，一年共可以节约用煤多少千克？
<gadget id="calculator">12 * 72 * 85</gadget>
<output>73_440</output>

<result>73_440</result>