13. Calculate the present worth needed to finance and maintenance of water supply station if i = 12%. Take the following information into consideration: Initial cost of the station Annual maintenance cost of the station Initial cost of the pumps Annual maintenance cost of pumps Initial cost of the pipes Annual maintenance cost of the pipes Services life of the station Services life of the pumps Services life of the pipes 15,000,000.00 EGP 2,000,000.00 EGP/year 4,000,000.00 EGP 500,000.00 EGP/year 150,000,000.00 EGP 5,000,000.00 EGP/year 50 years 10 years 25 years 3