Cash inflows: Sales £8,500, £5,000, £4,000; Rent received £1,000 each month
Cash outflows: Wages £1,000, £800, £700; Raw materials £1,000, £800, £500; Marketing £200 each month; Rent £1,500 each month; Loan repayment £150 each month
Net cash flow: £5,650, £2,550, £1,950
Opening balance: £0, £5,650, £8,200
Closing balance: £5,650, £8,200, £10,150