certain town completed an industrial output value of 15 million yuan the year before last, and it is expected to complete 18 million yuan last year. By what percentage was the industrial output value of last year higher than that of the previous year?
某个乡镇前年完成工业产值1500万元，去年预计完成1800万元，去年的工业产值比前年多百分之几？
<gadget id="calculator">1_800 - 1_500</gadget>
<output>300</output>

<gadget id="calculator">300 / 1_500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>