I am trying to formulate a Linear Programming Problem using SOLVER.
Having some difficulties, can anyone help. The problem is:

I have a works contract for 4 months. The contract requires (a) 9 trucks
in month-1, (b) 11 trucks in month-2, (c) 10 trucks in month-3, and (c)
7 trucks in month-4.

I can lease the trucks on 1-month, 2-months, 3-monts, and/or 4-months
lease. The cost of 1-month, 2-months, 3-months, and 4-months lease is
$3,200; $2,960, $2,580, and $2430, respectively.

What contracting strategy should I adopt in order to minimize costs.

Your prompt response will be very highly appreciated.


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