What is ending retained earnings for Shiver Ice House?

Common Stock $122,500
Cash $117,640
Supplies $2,000
Prepaid Rent $3,700
Revenue $20,500
Retained Earnings $30,500
Accounts Payable $25,500
Accounts Receivable $23,450
Office Equipment $24,300
Unearned Revenue $5,157
Utilities Expense $427
Shaving Equipment $32,640
$44,873
$50,573
$25,230
$20,073
$30,073