Answer:
2016
a.	Dr Account receivable	$1,353,000	
Cr Sales revenue $1,353,000
Dr Cost of goods sold	$979,100	
Cr Inventory $979,100
b	Dr Allowance for doubtful accounts	$20,900	
Cr Account receivable $20,900
c	Dr Cash	$669,200	
Cr Account receivable $669,200
d Dr Bad debt expense $33,495
Cr Allowance for doubtful accounts $33,495
2017
e	Dr Account receivable	$1,544,700	
Cr Sales revenue $1,544,700
Dr Cost of goods sold	$1,318,300	
Cr Inventory $1,318,300
f	Dr Allowance for doubtful accounts	$27,000	
Cr Account receivable $27,000
Dr Cash	$1,194,200	
Cr Account receivable $1,194,200
h Dr Bad debt expense	$33,147	
Cr Allowance for doubtful accounts $33,147
Explanation:
Preparation of the journal entries to record Liang's 2016 and 2017 summarized transactions and its year-end adjustments to record bad debts expense
2016
a.	Dr Account receivable	$1,353,000	
Cr Sales revenue $1,353,000
Dr Cost of goods sold	$979,100	
Cr Inventory $979,100
b	Dr Allowance for doubtful accounts	$20,900	
Cr Account receivable $20,900
c	Dr Cash	$669,200	
Cr Account receivable $669,200
d Dr Bad debt expense $33,495
Cr Allowance for doubtful accounts $33,495
($1,353,000-$669,200-$20,900=$662,900)
($662,900*1.90%+$20,900)	
($12,595+$20,900=$33,495)
2017
e	Dr Account receivable	$1,544,700	
Cr Sales revenue $1,544,700
Dr Cost of goods sold	$1,318,300	
Cr Inventory $1,318,300
f	Dr Allowance for doubtful accounts	$27,000	
Cr Account receivable $27,000
Dr Cash	$1,194,200	
Cr Account receivable $1,194,200
h Dr Bad debt expense	$33,147	
Cr Allowance for doubtful accounts $33,147
($1,544,700+$662,900-$1,194,200-$27,000=$986,400)
($986,400*1.90%=$18,742)
($18,742+$27,000-$12,595=$33,147)