Hongguang Chemical Fertilizer Factory produced 500,000 tons of fertilizer last year, and plans to produce 700,000 tons this year. What percentage is the increase in production this year compared to last year?
红光化肥厂去年生产化肥50万吨，今年计划生产70万吨，今年计划比去年增产百分之几？
<gadget id="calculator">70 - 50</gadget>
<output>20</output>

<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>