Trick to double your money - never double your debt

The "Rule of 72" is a quick and simple formula used to estimate the number of years it would take to double an investment at a fixed annual rate of return.

Scottz Lip - The Snipe Investor

2/12/20242 min read

trick to double your money
trick to double your money

The "Rule of 72" is a quick and simple formula used to estimate the number of years it would take to double your investment at a fixed annual rate of return. The formula is:

For example, if you have an investment with an annual return of 8%, it would take approximately 72/8=9 years to double your money. Your $1000 will double in 9 years at 8% interest.

This is my favourite "never double your debt" is an extension of this rule, emphasizing the importance of managing debt responsibly. The idea is that while you might aim to double your investments using the Rule of 72, you should be cautious about letting your debt double. In other words, it's a reminder to avoid accumulating debt at a rate that could quickly become unmanageable.

Your debt can double for the same reason if you borrow $1000 at 8%, forgotten to pay it off (despite many reminders from your credit card company), your debt will now become $2000 in 9 years.

However, we know that credit card interest rate is 24% upwards (now is 25.9% to 26.9% as of this writing)

If you borrow $10,000 at 25%, forgotten to pay, it takes about 34 months or 2.9 years to owe them $20,000. Is faster that your salary growth can keep up.

While the Rule of 72 is a useful heuristic for estimating investment growth, it's essential to note that it provides an approximation and doesn't account for factors like taxes or fluctuations in the rate of return.

rule of 72 double your money
rule of 72 double your money

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