I need help on a LINEAR PROGRAMMING PROBLEM!!?

Each quart of the regular skin lotion that Harold makes contains 2 cups of oil and 1 cup of cocoa er. Each quart of his extra rich lotion contains 1 cup of oil and 2 cups of cocoa er. Harold makes $10 profit on each quart of the regular lotion and an $8 profit on each quart of the extra rich lotion. If he has 12 cups of oil and 8 cups of cocoa er on hand, how many quarts of each type of lotion should he make to maximize his profits?