An engineer has a fluctuating future budget for the maintenance of a particular machine. During each of the first 5 years, dollar 1000 per year will be budgeted. During the second s years, the annual budget will be dollar 1500 per year. In addition, dollar 3500 will be budgeted for an overhaul of the machine at the end of the fourth year, and again at the end of the eighth year. What uniform annual expenditure would be equivalent, if interest is 9 percentage per year