A painting operation is performed by production worker at a labor cost of $1.40 per unit. A robot spray-painting machine, costing $15,000, would reduce the labor cost to $0.20 per unit. If the device would be valueless at the end of 3 years, what is the minimum number of units that would have to be painted each year to justify the purchase of the robot machine?

Mattress wholesalers, inc. is constantly trying to reduce inventory in its supply chain. last year, cogs was $7.47 million and inventory was $1.47 million. this year, cogs is $8.65 million and inventory investment is $1.64 million.a) what was its weeks of supply last ) what is its weeks of supply this ) is mattress wholesalers making progress in its inventory reduction effort? since the number of weeks that cover the supply has mattress wholesalers is making in its inventory reduction effort.