Letting t=number of 20,000 railroad tank cars in the​ fleet, 2t−4 5,000​-gallon railroad tank​ cars, and −3t+27 10,000 gallon railroad tank cars will be in the fleet for a certain range of t. The cost of leasing a 5,000​-gallon tank car is ​$550 per​month, a 10,000​-gallon tank car is ​$650 per​ month, and a 20,000​-gallon tank car is ​$1250

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