A cement factory produced 4,500 tons of cement last year. This year it plans to produce 900 tons more than last year. What percentage does it plan to increase this year compared to last year?
某水泥厂去年生产水泥4500吨，今年计划比去年多生产900吨，今年计划比去年增产百分之几？
<gadget id="calculator">900 / 4_500</gadget>
<output>1/5 = around 0.2</output>

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