A city department has a computer unit and rents five computers at a yearly rental of $1,400 per machine. In addition, the cost to the department for the maintenance and repair of each of these machines is $100 per year. Five computer operators, each receiving an annual salary of $30,000, and a supervisor, who receives $38,000 a year, have been assigned to the unit. This unit performs the work previously performed by 10 employees whose combined salary was $324,000 per year. On the basis of these facts, the savings that will result from the operation of this unit for five years will be nearly