A field produces 1,500 kilograms of grain this year, which is 300 kilograms more than last year. How much is the increase?
一块地今年产粮食1500千克，比去年多产300千克，增产了百分之几？
<gadget id="calculator">1_500 - 300</gadget>
<output>1_200</output>

<gadget id="calculator">300 / 1_200</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>