The chemical fertilizer plant plans to produce 1 million tons of fertilizer in June, but the actual production is 900,000 tons. What percentage is the reduction?
化肥厂六月计划生产化肥100万吨，实际生产90万吨，减产了百分之几？
<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>