Hongxing Fishery produces 2,800 tons of fish this year, an increase of 300 tons over last year. How much is the increase?
红星渔场今年产鱼2800吨，比去年增产300吨，增产了多少．
<gadget id="calculator">2_800 - 300</gadget>
<output>2_500</output>

<gadget id="calculator">300 / 2_500</gadget>
<output>3/25 = around 0.12</output>

<result>3/25 = around 0.12</result>