Dear Anujjee,
I could not edit your password-protected worksheets. But here are my comments:
On Problem 1-4, the retained earnings would not be the balancing figure. You should find it out by adjusting the cash dividends from Net Income. This you should show as a working note.
Net income for the year= 72,000
Less Cash dividends = 16,000
Ending balance of Retained earnings = 56,000
As this is the first year, it is natural that there would not be any beginning balance of Retained Earnings.
On Problem 1-A, the similar argument applies. Yes, you are right, the supplies given in the question is supplies on hand (a closing stock as you pointed out)
Sincerely,
Rameshore