A well-known financial writer argues that he can earn 81 percent per year buying wine by the case. Specifically, he assumes that he will consume one $8 bottle of fine Bordeaux per week for the next 12 weeks. He can either pay $8 per week or buy a case of 12 bottles today. If he buys the case, he receives a 6 percent discount and, by doing so, earns the 81 percent. Assume he buys the wine and consumes the first bottle today.