4: For project finance modelling, project analysts need to ensure that their data is not affected by the problem of multicollinearity, autocorrelation and heteroskedasticity. Use the following data, and check whether the given data has such problems or not. In particular, you are required to calculate all the possible variance inflation factor (VIF). Calculate DW and BP statistics. Question 5: A Ltd. has total sales of Rs 3.6 crores and its average collection period is 90 days. The past experience indicates that bad debt losses are 2% on sales. The expenditure incurred by the firm in administering its receivable collection efforts are Rs 5,50,000. A factor is prepared to buy the firms receivables by charging 2% commission. The factor