问题描述：
英语翻译
Subtotal the data in the range B4:I19 so that at each change in Agent Last Name,a subtotal is added to the Base Cost of Trip column.Accept all other defaults in the Subtotal dialog box.Click the Level 2 outline symbol in the Outline bar to display only the totals for each agent and the Grand Total.
Subtotal the data in the range B4:I19 so that at each change in Agent Last Name,a subtotal is added to the Base Cost of Trip column.Accept all other defaults in the Subtotal dialog box.Click the Level 2 outline symbol in the Outline bar to display only the totals for each agent and the Grand Total.
问题解答：
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