Purchase-related transactions The Stationery Company purchased merchandise on account from a supplier for $15,500, terms 1/10,n/30. The Stationery Company returned merchandise with an invoice amount of $1,900 and received full credit. a. If The Stationery Company pays the invoice within the discount period, what is the amount of cash required for the payment? $ b. Under a perpetual inventory system, what account is credited by The Stationery Company to record the return