Suppose that the price received for gold extracted from time \(k\) to \(k+1\) is the average of the price of gold at these two times; that is, \(\left(g_{k}+g_{k+1}\right) / 2\).

However, costs are incurred at the beginning of the period whereas revenues are received at the end of the period. Find the value of the Complexico mine in this case.