Please help me understand part b2.

Some of the transactions of Kingbird Company during August are listed below. Kingbird uses the periodic inventory method. August 10 Purchased merchandise on account, $10,500, terms 2/10,n/30. 13 Returned part of the purchase of August 10, $1,000, and received credit on account. 15 Purchased merchandise on account, $14,300, terms 1/10,n/60. 25 Purchased merchandise on account, $18,000, terms 2/10,n/30. 28 Paid invoice of August 15 in full. Assuming that purchases are recorded at net amounts and that discounts lost are treated as financial expenses: Prepare the adjusting entry necessary on August 31 if financial statements are to be prepared at that time. (If no entry is required, select "No entry" for the account titles and enter 0 for the amounts. Credit account titles are automatically indented when amount is entered. Do not indent manually. List debit entry before credit entry.) Assuming that purchases are recorded at net amounts and that discounts lost are treated as financial expenses: Prepare general journal entries to enter the transactions. (If no entry is required, select "No entry" for the account titles and enter 0 for the amounts. Credit account titles are automatically indented when amount is entered. Do not indent manually. List all debit entries before credit entries.)