The cement plant planned to produce 4,350 tons of cement for the whole year. As a result, it produced 2,217.8 tons in the first half of the year and 2,479.5 tons in the second half of the year. How many tons more than planned?
水泥厂计划全年生产水泥4350吨，结果上半年生产了2217.8吨，下半年生产了2479.5吨，比计划增产了多少吨？
<gadget id="calculator">2_479.5 - 4_350</gadget>
<output>-1_870.5</output>

<gadget id="calculator">2_217.8 + (-1_870.5)</gadget>
<output>347.3</output>

<result>347.3</result>