Answer:
Inventory  1750 debit
 Accounts Payable  1,750 credit
--to record purchase--  	
Inventory  120 debit
 Cash  120 credit
--to record payment of freights--  	
Accounts Payable	400 debit
 Inventory  400 credit
--to record returned goods--  	
Accounts Payable	1350 debit
 Inventory             27 credit
 Cash          1323 credit
--to record payment within discount--  	
  	
Accounts Receivables	4700  debit
 Sales Revenues  4700 credit
--to record sale--  	
COGS  2450  debit
 Inventory  2450 credit
--to record COGS of the previous sale--  	
Cash  4700  debit
 Accounts Receivables  4700 credit
--to record collection in full amount--  	
Inventory  2550 debit
 Accounts Payable  2550 credit
--to record purchase--  	
Accounts Receivables	3650 debit
 Sales Revenues  3650 credit
--to record sale--  	
COGS  1950 debit
 Inventory  1950 credit
--to record COGS of the previous sale--	
Accounts Payable	190 debit
 Inventory  190 credit
--to record returned goods--  	
Accounts Payable	2360 debit
 Inventory    47.2 credit
 Cash        2312.8 credit
--to record payment within discount--  	
Explanation:
We reocrd each entry assuming the basic accounting principles
debit = credit
<u>first purchase balance:</u>
1,750 less 400 return = 1,350
discount 1,350 x 2% = 27
cash outlay 1,350 - 27 = 1,323
<u>second purchase balance:</u>
2,550 less 190= 2,360 balance
discount 2,360 x 2% discount = 47.20
cash outlay 2,360 - 47.20 =  2312.8