Problem 1. (20 Pts) Two storage structures, given code names Y and Z, are being considered for a military base. The military uses a 6% percent/year expected rate of return and a 24-year life for decisions of this type. The relevant characteristics for each structure are shown below.

Structure Y Structure Z

First Cost 24225 24225

Estimated Life 12 years 24 years

Estimated Salvage Value None $1,800

Annual Maintenance Cost $1,000 $720

a) What is the future worth of each machine? b) What is the decision rule for determining the preferred machine based on future worth ranking? c) Which structure should be recommended? d) Plot a graph for both alternatives future worth changes with expected ARR (annual rate of return) if expected annual rate of return varies from 6 % to 9% ?