inventory ballance /journal entry

1. New Books sold merchandise to Readers Corner at a selling price of $580,000. The merchandise had cost New Books $427,000.
2. Two days later, Readers Corner complained to New Books that some of the merchandise differed from what Readers Corner had ordered. New Books agreed to give an allowance of $13,000 to Readers Corner. Readers Corner also returned some books, which had cost New Books $2,600 and had been sold to Readers Corner for $4,100.
3. Just three days later, Readers Corner paid New Books, which settled all amounts owed.

inventory balance . im stuck on b.

	Effect on
Transaction	Inventory Balance
a.	+	580,000
b.	-
c.	NE

journal entry

Transaction	General Journal	Debit	Credit
a.		580,000
			580,000
b
c