The average monthly salary of employees in a factory used to be 1,200 yuan, but now the average monthly salary has increased to 1,500 yuan. What percentage has the increase been?
某工厂职工原来平均月工资是1200元，现在平均月工资增加到1500元，增长了百分之几？
<gadget id="calculator">1_500 - 1_200</gadget>
<output>300</output>

<gadget id="calculator">300 / 1_200</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>