Uncle Zhang’s piece of farmland was planted with ordinary rice last year, and the yield was 1200 kg. This year, after sowing new varieties of rice, the output will reach 1,440 kilograms, how much more than last year?
张大伯的一块农田去年种普通水稻，产量是1200千克．今年改播新品种水稻后产量达到1440千克，比去年增产多少千克？
<gadget id="calculator">1_440 - 1_200</gadget>
<output>240</output>

<result>240</result>