On September $1,$ Sunland Supply had an inventory of $15$ backpacks at a cost of $$10$ each. The company uses a perpetual inventory system. During September, the following transactions and events occurred.

Sept. $4$ Purchased $70$ backpacks at $$10$ each from Hunter, terms $\frac{2}{10},\frac{n}{30}.$

Sept. $6$ Received credit of $$50$ for the return of $5$ backpacks purchased on Sept. $4$ that were defective.

Sept. $9$ Sold $40$ backpacks for $$43$ each to Oliver Books, terms $\frac{2}{10},\frac{n}{30}.$

Sept. $13$ Sold $15$ backpacks for $$43$ each to Heller Office Supply, terms $\frac{n}{30}.$

Sept. $14$ Paid Hunter in full, less discount.

Journalize the September transactions for Sunland Supply. $($List all debit entries before credit entries. Credit account titles are automatically indented when the amount is entered. Do not indent manually. Record journal entries in the order presented in the problem.$)$