Hongxing Stationery Factory produced a total of 168 sets of stationery in the first 4 months. According to this calculation, how many sets of stationery can this factory produce in a year?
红星文具厂前4个月共生产文具168套，照这样计算，这个厂一年能生产文具多少套？
<gadget id="calculator">168 / 4</gadget>
<output>42</output>

<gadget id="calculator">42 * 12</gadget>
<output>504</output>

<result>504</result>