解决方案：类型和类型转换

以下是上一题的解决方案：

Quiz: Total Sales

weekly_sales = int(mon_sales) + int(tues_sales) + int(wed_sales) + int(thurs_sales) + int(fri_sales)
weekly_sales = str(weekly_sales)  #convert the type back!!
print("This week's total sales: " + weekly_sales)

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