Answer:
(a) The journal entries are as follows:
(i) Service revenue A/c Dr. $80,500
To retained earnings $80,500
(To record the service revenue)
(ii) Retained Earnings A/c Dr. $44,580
To Operating Expenses $2,880
To Rent expenses $7,000
To Salaries expenses $32,600
To Supplies expenses $2,100
(To record the expenses)
(iii) Retained earnings A/c Dr. $4,900
To dividends $4,900
(To record the dividends)
(b) Balance in the Retained Earnings account after the closing entries are posted:
= Beginning Retained Earnings + Revenue - Expenses - Dividends
= $20,300 + $80,500 - $44,580 - $4,900
= $51,320