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["Product","Price","Discount Volume","Discount"]
["Apples",10,100,0.05]
["Mangoes",30,50,0.1]
["Oranges",8,100,0.05]
["Pears",12,100,0.05]
[]
[]
["Product","Volume","Invoice Amount"]
["Apples",50,{"$f":"InvoiceAmount(A9,B9,$A$1:$D$5)","v":{"$error":"#VALUE!"}}]
["Pears",200]
["Apples",150]
["Mangoes",50]
["Apples",20]