What are the factors that affect the requirement of working capital?

A Proforma Cost Sheet of XYZ Company provides the following data :

The following is the additional information :

Average Raw Material in stock : One Month
Average Material in process : Half a Month
Credit allowed by suppliers : One Month
Credit allowed to debtors : Two Months
Time lag in payment of wages : One and a half weeks
Time lag in payment of overheads : One Month

One-fourth of sales are on cash basis.
Cash balance is expected to be Taka 1,20,000.
You are required to prepare a statement showing the Working Capital needed to finance a level of activity of 70,000 units of output. You may assume that production is carried on evenly throughout the year and wages and overheads accrue similarly.