Investment Accounts In order to retire comfortably your investment accounts should average 5-8% rate of return. Calculate the time it will you to double your investment use the Power of 72 Formula based upon the following scenarios: ● You’re getting a 5% rate of return on your 401k and currently have $10,000 in your account ● You’re getting a 8% rate of return on your Mutual fund and you currently have $2,000 in your account. ● You’re getting a 7% rate of return on your IRA and you currently have $50,000 in your account.