This problem has some inherent issues with wording that make it difficult to determinewhether the orientation is from the Assembly Department or the Machining Department,which affects the annual demand $($D$),$ which the book calculates as D $=250$ work days$/$year $*100$ parts$/$day $=25,000$ instead of using the estimated demand $($D$)$ provided. Furthermore,part $($a$)$ asks for EOQ when their intention was to perform the EMQ calculation and viceversa for part $($c$).$