Question: A retrofitted high-efficiency 4-stage compression unit with compression ratio value of 2.5 is being considered for an offshore natural gas liquefaction plant. The high-efficiency compression unit can be purchased and installed for 1260,000 OMR, and it will save an estimated 400,000 kilowatt-hours (kWh) of electric power each year over an eight-year period. The price of commercial unit of electricity is 0.02 OMR/kWh, and the LNG Company uses a MARR of 12.5% per year in its economic evaluations of overhauled compression unit. The market value of the multistage compression unit will be 900,000 OMR at the end of eight years, and additional annual operating and maintenance expenses are 300,000 OMR and 250,000 OMR, respectively. Use the PW method to determine whether this multistage compression unit should be installed at LNG plant