A geologist has identified a surface vein of copper, the rights to which have been sold to Cannecon Copper. As the ore lies on the surface, the cost function depends only on the rate of extraction: K2 (3(3):? where Y1 represents amount extracted in period 't = 0, 1, 2...' The price of copper ore in the world market is currently $100lunit. Thus, the profit each period is xz(Ij)=100-K-% Cannecon's geologists have estimated that the ore vein (deposit) contains 80 units of copper ore. Cannecon's managers have created a short-term asset portfolio that returns 5% per annum. During how many periods will Cannecon extract from this vein of ore? \f