Question 4 (21 points) Refer to the following actual schedule and item cost table of ABC Contractor: Work, Items 0% 35% 65% 90% 100% A 0% 45% 100% B 10% 135% :65% 100% C 10% 25% 70% 100% D Month 1 Month 2 Month 3 Month 4 Month 5 Work Quantity Actual unit cost Quoted unit price on Item contract A 100 $ 2000 $ 3000 B 40 $ 6000 $ 5500 50 $ 5000 D 20 $3500 $4500 $3000 Suppose there is a two-month delay of the owner's payment. That is, at the end of Month (N+2), the owner will pay the contractor for the work items completed in Month N. Suppose there is a retainage of 3% for all the progress payments. The retainage is returned in the last payment. (a) Calculate the units of A, B, C and D respectively, completed within EACH month (Month 1 to Month 5). (5 points) (b) Calculate the actual expenditures of ABC Contractor in Month 1 to Month 8. (4 points) (c) Calculate the owner's payments at the end of Month 1 to Month 8. (4 points) (d) Calculate the cumulative expenditures and the cumulative incomes of ABC Contractor at the end of Month 1 to Month 8. (4 points) (e) Is there overdraft in Month 4 and in Month 6? (4 points)