9/5 Mark Retail Inc. sells on account, merchandises to Eva Beauty Supplies, valued at $7,800. Credit terms were 2/10,n/30. Mark Retail Inc. had purchased those merchandises for $5,500. 9/6 FOB Shippint Point, for $200, was paid by cash by the responsible party. 9/10 Eva Beauty Supplies returned \$2,000 worth of merchandises to Mark Retail Inc. Mark Retail Inc. had purchased those merchandises for $1,100. 9/14 Eva Beauty Supplies settle (paid) the account with Mark Retails. Perpectual Inventory Systems in Buyer's Books Perpectual Inventory Systems in Seller's Books Periodic Inventory Systems in Buyer's Books Periodic Inventory Systems in Seller's Books