Question: We have 210,000 euros to invest in the stock market. They recommend two types of actions. Those of type A, which yield 10% and those of type B, which yield 8%. We decided to invest a maximum of 130,000 euros in those of type A and at least 60,000 in those of type B. We also want the investment in those of type A to be less than twice the investment in B. What does the distribution have to be of the investment to obtain the maximum annual interest?