A commercial truck dealership gets an allocation for 100 trucks from the manufacturer. Model A can be sold at 4500 above factory invoice, Model B at 5200, Model C at 4500, Model D at 4000. The dealership sold plenty of trucks last year, and is now including the halo model, (Model Elite-t Limited) in that allocation. This new model can be marked up at 16500 above invoice. At least 25% of the total order must be the fuel-efficient Model D Model C is a gigantic Truck and it can't count no more than 5% of the total order the dealer has to order at least one Model Elite-t Limited The dealership will get one Model Elite-t Limited for every 19 Model D ordered Since Model D and Model B share many common parts, the manufacturer produces plenty of them. So, they must account for 2/3 of the...