James decides to make a bathtub full of jello.  For every pound of water, you need 1.5 tablespoons of jello mix.  The bathtub can hold 6 cubic feet of water.  Each cubic foot of water is 7.5 gallons.  A gallon of water weighs 8 pounds.  A tablespoon of jello mix costs $0.50.  How much did he spend to fill his tub?
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