Answer:
2021
Due to the Accrual principle in Accounting, the revenue for 2021 will be the gift cards that were earned (redeemed) in 2021.
= 5,000 + 3,390 + 3,080 + 2,380
= $13,850
2022
Any gift cards that have not been redeemed within 12 months are not likely to be redeemed so the remaining gift cards can be said to be redeemed in 2022 which would mean that the revenue in 2022 is;
= 19,500 - 13,850
= $5,650