In a manufacturer the current system is producing 8 units/day with 4 workers, each working 8 hours/day. The payroll cost of the workers is $640/day, and the operations costs are $400/day. If the company makes an investment to the old system, the new system will produce 14 units/day with the current workers. The payroll costs will not change, but the operation costs will increase to $800/day. Compare the productivity changes, and advise the company whether to make this investment?