acca f9 question

Hi everybody,

Please help me, i dont’t understand clearly this question:

The table below gives information extracted from the annual accounts of Management plc for the past year.
Management plc – Extracts from annual accounts
Year 1
Inventory: raw materials £108,000
work in progress £ 75,600
finished goods £ 86,400
Purchases of raw materials £518,400
Cost of production £675,000
Cost of goods sold £756,000
Sales £864,000
Receivables £172,800
Payables £ 86,400
Required
Calculate the length of the working capital cycle (assuming 365 days in the year). ?