You are required to show all the necessary steps and to reach the final numeric answer. The Complexico mine is for lease. This mine has been worked heavily and is approaching depletion. It is becoming increasingly difficult to extract rich ore. The main managerial decision for operating the mine is to decide at the beginning of each year how much gold to extract from the mine. Let x be the amount of gold remaining in the mine at the beginning of a year, the cost to extract y (0