Roup assignment for bussiness information system

I have group assignment and i chose number 2 which is (Review the data in Customers.xls and determine who the cafeas best customers are, which best selling product and which month shows the highest sales. In addition, include the types of data quality issues you observe in the spreadsheet. Discuss how low quality information is affecting the cafA©as business.) I have got the slide which is linke it with this topic and Customers.xls also marking guidelines which is have to cover those points a? Identified best cafA©as customers a e.g., who, how many, etc. a? Identified the best selling product(s) a? Identified the best selling month a? Provided comments on the potential data quality issues in the given Customer file.

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Referencing Requirements:
i have got slides