Mina's computer system has been down several times over the past few months, as shown below. Number of breakdowns Monthly frequency 0 1 7 2 641 2 3 4 Every time the system goes down, the company loses an average of RM500 in time and service costs. They are thinking about signing a contract for preventive maintenance. With preventive maintenance, the system would be down on average only 0.5 times each month. Preventive maintenance would cost RM400 each month. Which is less expensive, breakdown or preventive maintenance?