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4. (25 pts.) Powerco has three electric power plants that supply theneeds of four cities. Each power plant can supply the following numbers of kilowatt (kWh) of electricity: plant 1-35 million; plant 2-50 million; plant 3-40 million. The peak power demands in these cities (kWh) are as follows: city 1-45 million, city 2-20 million, city 3-30 million, city 4-30 million. The cost of sending 1 million kWh of electricity from plant to city depend on the distance the electricity must travel. The shipping costs are shown in the following table. Use the transportation modd to minimize the total transportation cost and find thenew Z value. **** Show only the first iteration To From City 1 City 2 City 3 City 4 1 $8 $6 $10 $9 Plant 2 $9 $12 $13 $7 3 $14 $9 $16 $5 5100