Compare D & F using benefit/cost-ratio analysis. Use present worth as you do this. 5 refer to the following data (assume i= 5%): Alt. A B D E Cost UAB Salv. Life $10k $3k $1k 7yrs 11k 3100 1100 7 16k 3100 1500 14 12k 3600 1200 7 13k 0 7 11k 3k 1100 7 F