An existing robot is used in commercial material lab. Due to service requirement and upgrade is necessary at a cost of $2,000. A new robot will be consider for possible replacement. MARR before income tax is 6%. More information below. Should the existing robot be replaced?

Please help. You can't use Excel or computer. I need all the process with steps written. That way I can practice for my exam. Thank you.

Defender Current market value Upgrade cost(year 0) $40,000 $ 2,000 Annual Expenses (Geometric series) $1,400 the first year, from the Second, will increase by f= 5%/yr. 8 years Useful life(years) Market Value at the end of Year 8 (MV) $1,500 (Cost of disposal) Challenger Purchase Cost Installation Cost $60,000 $5,500 Annual Expenses $1,000 /yr and a Arithmetic Gradient Series of G=100/yr From second (2) year throght 10th. 10 years Useful life(years) Market Value at the end of Year 10 $6,000 a. EUAC or AW defender b.EUAC or AW challenger C.Final Decision