On page 77, Jonah counsels the team to "get the most out of the bottlenecks" once they are identified. Part of Jonah's early advice for a bottleneck is, "Don't have it process defective parts." Let's investigate what that means for the NCX-10 which, true to its name, processes one part every 10 minutes (or 6 parts per hour). Ralph notes that the NCX-10 currently has 585 production hours per month - or 19.5 each day. On average each month, 344 parts processed by the NCX-10 were later scrapped by Quality Control. Rogo's team implemented Jonah's advice and Quality Control began rejecting defective parts before they reached the NCX-10 rather than after. This resulted in a net gain of 4.5% greater productivity for the NCX-10. How many more usable parts did the NCX-10 produce each week?