Acme industries manufactures microwave ovens with a production workforce of 450 full-time workers. the process includes using pneumatic screwdrivers and drills and manually lifting boxes weighing up to 35 pounds from a height of 24" to a height of 36". over the past year, there have been 35 cases of carpal tunnel syndrome and 15 cases of lower back strain reported. there were 850,000 total work hours at the facility for the year.