<prompt> Human: Has anyone read The Wealthy Barber? I am curious to know if anyone checked the numbers in it. I am wondering about the calculations surrounding saving 30 a month from age 18 to 65 to have over two and a half million dollars assuming a 15 rate of return. When I use the FVIFA tables to calculate the ending value of a 360 30 a month invested, 15 annual return yearly investment into the same vessel, I get only 1.7 million. Its been a while since I have done these calculations in a class, so I could be leaving something out or using the wrong calculation. Any knowledge on this subject will be helpful to further my own or help me remember. Thank you kindly.  <response>: If you use a time value of money calculator you end up with 2,646,156.40 so that is almost certainly what the authors used. PV 0 Rate 15 PMT 30 Periods 564 Compounded monthly Notice that compounding annually gives the results that you found. So change Periods to 47 and PMT to 360 and you end up with 1,707,653.66. Those results explain the different calculations used. 