Example 2 him spend $5,000 a month perpetually after retirement. Assume a continuous money flow Paul is 25 years old and plans to retire at 65. He wants to have a fund at 65 that will let Suppose that after his retirement Paul puts the money in a fund paying interest at an annual rate of 4%, compounded continuously. How much will Paul need for his retirement? a) Suppose that Paul starts to invest a fixed amount each month from now until he retires, toa fund that pays interest at an annual rate of 6%, compounded continuously. How much should he invest each month? b)