Answer:
I guess that you need the journal entries:
a.
Dr Cash 51,200
Cr Sales revenue 51,200
Dr COGS 28,797
Cr Inventory 28,797
b.
Dr Sales revenue 600
Cr Cash 600
Dr Inventory 360
Cr COGS 360
c.
Dr Accounts receivable 10,000
Cr Sales revenue 10,000
Dr COGS 4,750
Cr Inventory 4,750
d.
Dr Cash 5,000
Cr Accounts receivable 5,000
e.
Dr Sales allowances
Cr Accounts receivable