Show all steps, do NOT use Excel to calculate options

An engineer is considering the replacement of a 10-year-old special-purpose pump. The pump is used to provide 14,000 gallons per minute of a liquid having specific gravity of 1.35 at 12 feet total dynamic head. The existing pump now has a salvage value of $5,000 and operates at 70% efficiency. If this unit is retained for 2 more years, it will be sold for $2,000 and replaced by a new pump at a cost, including installation, of $20,000. It is estimated that the new unit, which will be installed at the end of 2 years, will operate with an efficiency of 85% and will have a service life of 10 years with $5,000 salvage value at the end of that time. Two other alternatives are under consideration. These alternatives require that the old pump be replaced immediately by either of the following pumps: Pump B Pump C Initial cost $15,000 $24,000 Installation cost $1, 500 $1, 500 Service life 15 years 14 years Salvage value $4, 500 $4,000 Efficiency 80% 88% Maintenance costs are assumed to be the same for all alternatives, and power is available at $0.08 per kilowatt-hour. Operation will be 24 hours per day for 300 days per year. For a MARR of 15%, which alternative should be selected