Sales Analysis I

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Example Testcases:

{"headers":{"Product":["product_id","product_name","unit_price"],"Sales":["seller_id","product_id","buyer_id","sale_date","quantity","price"]},"rows":{"Product":[[1,"S8",1000],[2,"G4",800],[3,"iPhone",1400]],"Sales":[[1,1,1,"2019-01-21",2,2000],[1,2,2,"2019-02-17",1,800],[2,2,3,"2019-06-02",1,800],[3,3,4,"2019-05-13",2,2800]]}}