Master Li's working hours are: 7:30-11:30, and there are 428 parts processed in total. How many parts does Master Li process per hour on average?
李师傅上班时间是：7：30～11：30，共加工零件428个，李师傅平均每小时加工零件多少个？
<gadget id="calculator">428 / 4</gadget>
<output>107</output>

<result>107</result>