Maintenance costs for a machine with an expected 10-year life are estimated to be $1,700 each year for the first 5 years. Followed by a $2,000 expenditure in year 8 and a $2,500 expenditure in the year 10. What is the equivalent present worth cost? Assume i= 6% per year. Select one: O a.-10,233 O b.-11.497 Oc-9812 O d.-8,127 O e.-6863