Solution:
(a) Journal entries for December 31, 2020, and December 31, 2021.
Cash 240,000
Rent Revenue 240,000
(2020 slips - 300 x 800 = 240,000)
Cash 152,000
Unearned Rent Revenue 152,000
(2021 slips - 200 x 800 x (1.00 - 0.05) = 152,000)
Cash 38,400
Unearned Rent Revenue 38,400
(2022 slips - 60 x 800 x (1.00 - 0.20) = 38,400)
(b) Rent Revenue for 2020:
Paid in 2012, earned in 2020 152,000
Paid in 2013, earned in 2020 80,000(100 x 800)
Total 232,000