Teradyne Connection Systems makes “backplanes” (large printed circuit-board assemblies) for communication and storages devices. Recently, the company converted its production process from batch into assembly line, [t also used computers to assist the workers at workstations. As a result, productivity has shot up. The site manager, Mark Galvin, says: “Operators made 300 backplanes in seven days using three shifts by a batch process (i.e., 7 days, 24 hours a day). Later, they assembled 500 backplanes in five days using just two shifts with the new assembly-line approach (i.e., 5 days, 16 hours a day).” Assuming that the same number of workers worked during each shift, and before and after the conversion, what is the percentage growth in labour productivity?