we're learning linear programming and this is the problem (i know the answer but i don't know how to get to it, i fell like we don't have enough info about problem) (answer: 560€, 560 donuts and 280 water bottles) John sells donuts and water. The mass of the donut is 0.125 kg, and the water is 0.5 kg. John must have at least 80 donuts and 60 bottles of water every day. For the two donuts sold, John sells two bottles of water. The profit is 80 cents per donut, and 40 cents per bottle of water. How many donuts and bottles of water should John sell to achieve the highest possible profit?