Ajax Fuels is developing a new additive for aeroplane fuels. The additive is a mixture of three ingredients: A, B and C. For proper performance, the total amount of additive (amount of A + amount of B + amount of C) must be at least ten grams per litre of fuel. However, because of safety reasons, the amount of additive must not exceed 15 grams per litre of fuel. The mix or blend of the three ingredients is critical. At least one gram of ingredient A must be used for every gram of ingredient B. The amount of ingredient C must be at least one-half the amount of ingredient A. If the costs per gram for ingredients A, B and C are E0.10, E0.03 and E0.09, respectively, find the minimum-cost mixture of A, B and C for each litre of aeroplane fuel.