Xingguang Chemical Factory saved 12.34 tons of coal in the first half of the year and 7.8 tons in the second half of the year. How many tons of coal does this factory save this year?
星光化工厂上半年节约用煤12.34吨，下半年节约用煤7.8吨，这个厂今年节约用煤多少吨？
<gadget id="calculator">12.34 + 7.8</gadget>
<output>20.14</output>

<result>20.14</result>