please help. please solve for AW for ALL FOUR ALTERNATIVES SHOWN ON CHART.

You have been asked to evaluate the economic implications of various methods for cooling condenser effluents from a 200-MW steamelectric plant. There are two basic types of cooling towers: wet and dry. Furthermore, heat may be removed from condenser water by (1) forcing (mechanically) air through the tower or (2) allowing heat transfer to occur by making use of natural draft. Consequently, there are four basic cooling tower designs that could be considered. Assuming that the cost of capital to the utility company is 15% per year, your job is to recommend the best alternative (.e., the least expensive during the service life). Further, assume that each alternative is capable of satisfactorily removing waste heat from the condensers of a 200-MW power plant. What noneconomic factors can you identify that might also play a role in the decision-making process? Click the icon to view the alternatives description. Click the icon to view the interest and annuity table for discrete compounding when/= 15% per year. Wet Tower Mech. Draft Print Alternative Wet Tower Natural Draft $9.2 million None Initial cost $3.1 million Power for I.D. fans Power for pumps Mechanical maintenance/year 40 200-hp I.D. fans 20 150-hp pumps $0.11 million 30 years 20 150-hp pumps $0.13 million 30 years Service life Market value 0 0 100 hp=74.6 kW; cost of power to plant is 2.2 cents per kWh or kilowatt-hour, induced-draft fans and pumps operate around the clock for 365 days/year (continuously). Assume that electric motors for pumps and fans are 90% efficient. Dry Tower Mech. Draft Done $5.0 million 20 200-hp I.D. fans 40 100-hp pumps $0.15 million Dry Tower Natural Draft 30 years 0 $8.8 million None 40 100-hp pumps $0.12 million 30 years 0