how to get the answer and please provide the full calculation? i wanna study this one

c) ABS printing Inc. has a number of failures with their printers and is evaluating the possibility of outsourcing preventive maintenance to the manufacturer. Because of the risk associated with the failure, the cost of each failure is estimated at RM2,000. The current maintenance policy (with the current staff performing the maintenance) has yielded the following history as in the table below. This manufacturer will guarantee repairs on any and all failures as part of the service contract. The cost of this service is RM5,000 per year. Number of breakdowns Numbers of years in which breakdown occurred 012345 431550 I) Compute the expected number of breakdowns per year with the staff is performing the maintenance (5 marks) II) Calculate the cost of the current maintenance policy (3 marks) III) Choose the most economical policy (2 marks)