SOLUTION: Solve the variation equation The cost incurred by a trucking company vary jointly with the number of trucks in service and the number of hours they are used. When 5 trucks are u

Question 590790: Solve the variation equation
The cost incurred by a trucking company vary jointly with the number of trucks in service and the number of hours they are used. When 5 trucks are used for 7 hours each, the cost are $1925. Find the cost of using 12 trucks, each for 13 hours.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The cost incurred by a trucking company vary jointly with the number of trucks in service and the number of hours they are used.
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cost = k*t*h
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Solve for "k" using "when 5 trucks are used for 7 hours each, the cost are $1925".
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1925 = k*5*7
k = 55
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Equation:
cost = 55*t*h
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Find the cost of using 12 trucks, each for 13 hours.
Cost = 55*12*13 = $8580.00
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Cheers,
Stan H.

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