Probability of repair time:
On the basis of information available in this case problem, the repair time is determined through probability of occurring in one year. That is there is 20% chance to repair in 1 day, 45% chance to repair in 2 day, 25% chance to repair in 3 days, and 10% chance to repair in 4 days.
Random numbers:
There are 365 random numbers are selected through excel program sheet in order to determine average time between breakdowns, average repair time and average annual loss of revenue.