Energy rationing: In certain areas of the United States, power blackouts have forced some counties to ration electricity. Suppose the cost is $0.09 per kilowatt (kW) for the first 1000 kW a household uses. After 1000 kW, the cost increases to 0.18 per kW. (a) Write these charges for electricity in the form of a piecewise-defined function C(h), where C(h) is the cost for h kilowatt hours. Include the domain for each piece. Then (b) sketch the graph and determine the cost for 1200 kW.
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