Asset allocation题库 handbook部分，Remington Wealth Partners Case Scenario第6小题
· Goal 1: Over the next 20 years, she needs to maintain her living expenditures, which are currently $120,000 per year (90% probability of success). Inflation is expected to average 2.5% annually over the time horizon, and withdrawals take place at the beginning of the year, starting immediately.
怎么计算现值？考试的时候不能用excel表
答案里的这个公式怎么看不懂？在讲义里有讲过么？
