I understand that the answer to this question is 4 years because that's when the EUAC is at its lowest. I am wondering how to calculate PW and EUAC by hand using equations without Excel. Don't need to do all of them just one example to get me started would be great thanks!

A machine has a first (initial) cost of $50,000. Its market (salvage) value declines by 20% annually. The operating and maintenance costs start at $3,500 per year and climb by \$2,000 per year. The firm's MARR is 9\%. What is the economic life for this machine. 1. 2 years 2. 3 years 3. 4 years 4. 5 years A machine has a first (initial) cost of $50,000. Its market (salvage) value declines by 20% annually. The operating and maintenance costs start at $3,500 per year and climb by \$2,000 per year. The firm's MARR is 9%. What is the economic life for this machine. A machine has a first (initial) cost of $50,000. Its market (salvage) value declines by 20% annually. The operating and maintenance costs start at $3,500 per year and climb by \$2,000 per year. The firm's MARR is 9\%. What is the economic life for this machine. 1. 2 years 2. 3 years 3. 4 years 4. 5 years A machine has a first (initial) cost of $50,000. Its market (salvage) value declines by 20% annually. The operating and maintenance costs start at $3,500 per year and climb by \$2,000 per year. The firm's MARR is 9%. What is the economic life for this machine