Please write " please explain with the step on step on how to get the answer(the calculation) "

The state of Missouri has three major power-generating companies (A, B and C). During the months of peak demand, the Missouri Power Authority authorizes these companies to pool their excess supply and to distribute it to smaller independent power companies that do not have generators large enough to handle the demand. Excess supply is distributed based on cost per kilowatt hour. The following table shows the cost per kilowatt hour distributed to four smaller companies in cities W, X, Y and Z: Unfilled Excess Supply Power W X Y Z Demand A 12 4 9 5 B 8 1 6 6 1 12 4 7 (i) Propose ONE (1) method which is able to allocate the unfilled power demand to the four smaller companies. Solve the answer using the proposed method. (7 marks) (ii) Estimate the total lowest cost per kilowatt hour distributed to four smaller companies. (2 marks)