The fertilizer plant planned to produce 36 million tons of fertilizer last year, but the actual production was 36.9 million tons. What percentage increase was the actual production compared with the plan?
化肥厂去年计划生产化肥3600万吨，实际生产3690万吨，实际比计划增产百分之几？
<gadget id="calculator">3_690 - 3_600</gadget>
<output>90</output>

<gadget id="calculator">90 / 3_600</gadget>
<output>1/40 = around 0.025</output>

<result>1/40 = around 0.025</result>