Consider a four-step manufacturing process as illustrated in the following figure. Assuming that demand is 12000 units, Assume that the scrap cost is $10 at process 1,$10 at process 2 , and $8 at process 3 , and $8 at process 4 . The defective rates are 6%,5%,4%, and 3% respectively. Compute, a. The required input to meet demand. b. Total scrap cost for the given system. c. Total number of units scrapped in this four-step manufacturing process