Basil Brush Paint Company is developing a linear program to determine the optimal quantities of ingredients A and B to blend together to make oil-based and water-based paints. The oil-based paint contains 90 percent A and 10 percent B, whereas the water-based paint contains 30 percent A and 70 percent B. The company currently has 10,000 litres of ingredient A and 5,000 litres of ingredient B in inventory and cannot obtain more at this time. Let x1 denote the number of litres of oil-based paint, and x2 denote the litres of water-based paint. Which of the following constraints can be used to represent the constraint on ingredient B ? 0.3A+0.7B5,000 0.1x1+0.9x25,000 0.1x1+0.7x25,000. 0.7x1+0.3x25,000. None of the above