please answer quickly

Question 1 (30 points) A serial manufacturing process with three steps is provided below. 1 2 3 dy = 3% dy = 5% dz = 7% a) Calculate the required input to meet demand of 1,000 units? (10 points) b) Consider the system in question a) with each process is capable of rework and the rework rates are 60%, 75% and 80% for process 1, process 2 and process 3, respectively. What is the input required to satisfy a demand of 1,000 units? (10 points) c) Suppose that the scrap costs are negligible and the rework costs per unit are $40, $50, and $60 for process 1, process 2 and process 3 respectively, calculate the total rework cost for producing the demand of 1,000 units. (10 points)