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Assume that the maximum usage of electricity can be 2000 kilowatt-hour.

a) Identify the equivalent partitions and boundary values for the above requirement specification(s).

b) Derive all test input(s) and expected output(s) should be selected using equivalence partitioning method only.

\begin{tabular}{|l|} \hline 9 cents per kilowatt-hour for first 300 kilowatt-hour \\ \hline 8 cents per kilowatt-hour for the next kilowatt-hour (up to 600 kilowatt-hour) \\ \hline 6 cents per kilowatt-hour for the next kilowatt-hour (up to 1000 kilowatt-hour) \\ \hline 5 cents per kilowatt-hour for all electricity usage above 1000 kilowatt-hour \\ \hline \end{tabular}