Answer:
a.
Date Account Title Debit Credit
Dec, 31. 2020 Cash $1,000
Customer Deposits $1,000
b.
Date Account Title Debit Credit
Dec, 31. 2020 Customer deposits $800
Cash $800
c.
Date Account Title Debit Credit
Dec, 31. 2020 Customer deposits $120
Breakage Revenue $120
Cost of goods sold(0.8 * 120) $ 96
Inventory $ 96