a$)$Apply present worth analysis.

b$)$Use shortest life to establish the planning horizon's length and apply present woth

analysis again.

c$)$Use longest life to establish the planning horizon's length and apply present woth analysis once more.

d$)$Repeat PW analysis for $10$ years standard analysis period.

e$)$Consider an infinitely long planning period and calculate the annual worth for each

investment alternatives. Please solve by hand, not excel.