Neat calculation pls

QUESTION 2 The AW method is to be used to select the better alternative of the two machines listed below, at 10% per year. Answer the below questions: Machine R Machines First cost, $ 250,000 497,732 Annual operating cost, $ per year 40,000 50,000 Salvage value, $ 20,000 30,000 3 5 Life, years The AW of Machine S