Journalize entries for the following related transactions of Lilly Heating & Air Company using the net method under a perpetual inventory system. $($If an amount box does not require an entry, leave it blank.$)$

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a$.$  Purchased $$30,000$ of merchandise from Schell Co$.$ on account . Discovered that merchandise with an invoice amount of $$6,000$ purchased in $($a$)$ was defective and returned items, receiving crediting$,$ terms $2/10,$ n$/30.$

B$.$  Paid the amount owed on the invoice. 

C$.$  Discovered that merchandise with an invoice amount of $$6,000$ purchased in $($a$)$ was defective and returned items, receiving credit.