The formula is below and the answer, can someone show me how each of the calculations were figured out?

Landmark Coal operates a mine. During July, the company obtained 500 tons of ore, which yielded 250 pounds of gold and 63,700 pounds of copper. The joint cost related to the operation was $500,000. Gold sells for $325 per ounce and copper sells for $0.85 per pound. Allocate the joint costs using relative weight. With these costs, what is the profit or loss associated with Copper?

Answer:

-443,900.35
Weight of the Copper * Selling Price = $Revenue Minus Percentage which is Copper/Total Weight x Joint Costs = Cost Revenue - Cost = Profit or Loss