A steel plant has two sources of ore source A and source B In order to keep the plant running at least three tons of ore must be processed each day Ore from source A costs 20 per ton to process and ore from source B costs 10 per ton to process Costs must be kept to no more than 80 per day Moreover Federal Regulations require that the amount of ore from source B cannot exceed twice the amount of ore from source A If ore from source A yields 300 lbs of steel per te and ore from source B yields 400 lbs of steel per ton how many tons of ore from each source should be processed each day to maximize the amount of steel produced 3 tons from source A 0 tons from source B 2 tons from source A 4 tons from source B 1 ton from source A 2 tons from source B D 4 tons from source A 0 tons from source B