{Ch10) Determine the marginal cost to extend service for a machine for years 14. Assume an interest rate of 8% and a salvage amount at the end of year 0 of $18,000 (3 pts.) 1 2 3 4 i Salvage $16,000 $12,000 $8,000 $4,000 Maintenance $3,000 $3,500 $4,000 $4,500