Great Southern Consultants Group's computer system has been down several times over the past few months, as shown below. Number of breakdowns 0 1 2 3 4 Monthly frequency 9 2 4 4 1 Each time the system is down, the firm loses an average of $400 in time and service expenses. They are considering signing a contract for preventive maintenance. With preventive maintenance, the system would be down on average only 0.5 per month. The monthly cost of preventive maintenance would be $200 a month. Which is cheaper, breakdown or preventive maintenance?