Start by telling us why you're calling. 1  Here are some very popular reasons why other people call this Garmin number. 2  We have a few other tricks to try if you're calling Garmin, and if you are already viewing this on a phone or call-capable device, then you can click or tap below to just start a call.
Suppose you invest $100 at a compound interest rate of 10%. The rule of 72 tells you that your money will double every seven years, approximately: If you graph these points, you start to see the familiar compound interest curve:
The Rule of 72 is a quick and easy way to see how long it will take your money to double at a given interest rate. You take 72 and divide it by the interest rate. So for example, if you are earning 2% it will take 36 years for your money to double (72/2).The amount of money that is doing the doubling doesnât matter.he Rule of 72 is a quick and easy way to see how long it will take your money to double at a given interest rate. You take 72 and divide it by the interest rate. So for example, if you are earning 2% it will take 36 years for your money to double (72/2). The amount of money that is doing the doubling doesnât matter.