Kindly assist to show step by step working with explanations and formula for my understanding.. ty

The recent frequent heavy rainfalls have resulted in some flash ooding in the basement carpark of a commercial building. As directed by the PUB, the building management is required to install water pumping system to prevent future ooding. Relevant data for three alternative systems that met the operational requirements are given in the table below: _ Alternative A Alternative B Alternative C $150,000 $190,000 $240,000 Years 1 to 10: $l2,000 Years I to 10: $8,000 Annual 0&M cw 5' 5'00\" Years ll to :5: $13,000 Years I l to 20: $15,000 Market value at EoY 5 $45,000 $60,000 $ | 20,000 Market value at EoY 10 $3,000 $ | 5,000 $22,000 Market value at EoY IS _ $7.000 $15,000 WRR for this project is 6%. (a) If' the study period is 10 years, determine which alternative should be chosen using the PW method. State the main assumptions made. (5 marks) (.6) If the study period is 10 years, determine which alternative should be chosen using the IRR method. You may use any equation solver to compute iRRs after stating the relevant equations that need to be solved. (5 marks) (0) If the study period is 15 years, determine which alternative should be chosen using the PW method. State the main assumptions made. (5 marks) {(1') If the study period is innity, determine which alternative should be chosen using any method. State the main assumptions made