A company currently uses an old machine that costs $2,500 per year to operate. The old machine could be sold today for $500. The old machine has a remaining useful life of two years after which the machine will be scrapped for zero value. A potential replacement machine costs $1,000 per year to operate. The replacement machine has an estimated useful life of two years after which the machine will be scrapped for zero value. The acquisition cost of the replacement machine is $4,000. If the company purchases the replacement machine, total costs (for the two year period) will be than if the company keeps the old machine. Select one: a. 500 lower O b. 1,000 lower c. 500 higher O d. 1,000 higher e. total costs will remain the same regardless if the company keeps the old machine or buys the replacement machine