Machines X and Y are to be compared on the basis of present worth analysis. What is the equation that will yield the present worth of Machine X for use in the analysis at 10% annual interest rate? 4. Machine X Machine Y 95,000 Initial Cost,S Annual Cost, S/yr Salvage Value, $ Life, Years 80,000 20,000 10,000 15,000 30,000 (a) Pwx =-80,000-15,000 (P/A,10%, 4) + 30,000 (P/F,10%, 4) (b) Pwx =-80,000-20,000 (P/A, 10%, 4)-80,000 (P/F,10%,2) + 10,000(P/F,10%,4) (c) Pwx =-80,000-20,000 (P/A,10%, 2) + 10,000 (P/F,10%,2) (d) Pwx--80,000-20,000 ( P/A,10%, 4) + 10,000 (P/F,10%,4) (e) Pwx--80,000-20,000 ( P/A, 10%,4)-70,000 (PF, 10%,2) + 10,000(P/F,10%,4)