... and computationally. Imagine a cash register drawer witheight compartments, labelled 1 to 8, for pennies, nick-els, dimes, quarters, dollar bills, 5 dollar bills, 10 dollarbills, and 20 dollar bills, respectively. ... processing L mil-lion barrels of light crude and D million barrels of darkcrude produces 0:2 1L 0:55D barrels of fuel oil. Since3 million barrels are required, we have the constraint0:2 1L 0:55D ... conceptual and math-ematical models. Good LP software is available tosolve the problem if you can formulate a valid LPmodel of reasonable size. Linear programming encom-passes several activities....