The output of a certain factory is 5,000 pieces in January and 7,200 pieces in March. What is the average monthly growth rate in the first quarter?
某工厂的产量，一月份是5000件，三月份是7200件，那么第一季度平均每月增长率的百分数是多少？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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