Please solve the below mentioned question and provide answers along with proper workings and explanations

(pls do not use excel format or excel formulas to answers the below questions)

Q1)Porsche Automobil must purchase some new machines and needs to evaluate two different types. The first type of machine is the 'Skanska' machine, which costs $74,000 and is top-of-the-range equipment. The machine has a life of 8 years. Maintenance costs of $2,000 a year are expected for the first 4 years, followed by total maintenance and rebuilding costs of $13,000 in the fifth year. This cost is fully tax deductible in the fifth year. During the last 3 years maintenance costs are expected to be $4,000 a year. At the end of the 8 years the machine will have an estimated salvage value of $9,000.The second type of machine that Porsche Automobil is evaluating is the 'Cybel Machine', which costs $59,000 and has a life of nine years. Maintenance costs will be higher. In the first year they are expected to be $3,000, and this amount is to increase by $1,500 a year until the ninth year. In year 4 the engine will need to be rebuilt, and this will cost the company $15,000 in addition to maintenance costs in that year. This cost will be fully tax deductible in the fourth year. At the end of the 9 years, the 'Cybel Machine' will have an estimated salvage value of $8,000.

Assuming straight-line depreciation for both types of machines and a 40% tax rate, which of the two types of machines should Porsche Automobil purchase. The after-tax required rate of return is 8 percent.

NOTE: PLEASE SHOW YOUR WORKINGS FOR BOTH TYPES OF MACHINES AND EXPLAIN IN DETAIL WHICH OUT OF THE 2 TYPES OF MACHINES PORSCHE AUTOMOBIL SHOULD PURCHASE AND WHY ?