The output value of a factory last year was 2.5 million yuan, and this year's output value is expected to be 2.8 million yuan. How much does this year's output value increase compared with last year's output value?
某工厂去年的产值是250万元，今年的产值预计为280万元，今年的产值比去年的产值增产多少．
<gadget id="calculator">280 - 250</gadget>
<output>30</output>

<gadget id="calculator">30 / 250</gadget>
<output>3/25 = around 0.12</output>

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