Calculate 'Current Liabilities' from the followings:

Bills Payable = 3000, Machine = 5000; Prepaid Expenses= 4800, Accrued Income= 1200, Income Received in Advance= 600, Stock 2000, Cash=4000, Bills Receivables=1800, Outstanding Rent=800; Debtors = 2000; Creditors = 3000; Operating Expenses=500; Stationary Exp=400.