Q1. In the figure given below, operation 4 represents a rework operation on parts that fail inspection upon completion of operation 2. (Note: d; represents the defect rate for operation i) 2 7500 units d2=10 d.=4% d,=5% d,=50% a. How many units must the process start with in order to meet the required output of 7500 units in a week? b. Assume that operation 1 operate for 16 hours per day, five days per week. Assuming that 3 minutes standard time, 90% efficiency and 95% reliability, how many machines are needed for operation 1, given the information in part a