3. Select the optimal machine for your factory based on the Present Worth Analysis (40 marks). Machine A Machine B Initial cost Annual operating cost Salvage value $13,000 $4,500 $6,000 First 4 digit of your Student numbers $19,000 $9,000 $3,000 Extra cost every three years N/A Extra cost every six years N/A First 4 digit of your Student numbers $14,000. $15,000 Annual revenue excluding last year Length of life (in years) 6 8