Messi Corporation uses the perpetual inventory method. On March 1, it purchased $30,000 of entory, terms 2/10, n/30. On March 3, Messi returned goods that cost $3,000. On March 9, Messi paid the supplier. On March 9, Messi should credit a. purchase discounts for $600 b. inventory for $600. c. purchase discounts for $540. *d. inventory for $540. hift