2. You have made an investment in Argentina copper mines. The investment required $100,000 at time 0 and $10,000 two years later. In return you have received $20,000 after 4 years, $35,000 after 6 years, $35,000 after 8 years and $9,500 after 10 years. What is the yield (annual effective yield) on your investment? A) -1.5% C) 7.5% E) No solution to the problem B) 1.5% D) 8.5%