Oppenheimer Company purchased merchandise on account from a supplier for $17,200, terms 1/10, n/30. Oppenheimer Company returned $2,200 of the merchandise and received full credit. a. What is the amount of cash required for the payment within the discount period? $ b. Under a perpetual inventory system, what account is credited by Oppenheimer Company to record the return? Xanadu Company purchased merchandise on account from a supplier for $8,900, terms 1/10,n/30. Xanadu Company returned $1,500 of the merchandise and received full credit. a. If Xanadu Company pays the invoice within the discount period, what is the amount of cash required for the payment