Compounding, budgeting and the rules of thumb worth knowing. One plain-English money fact a day. General education only, not financial advice.

Rule of 72: divide 72 by an annual growth rate to estimate how many years it takes to double. At 8%, about 9 years.
$1,000 growing at 7% a year becomes about $7,600 after 30 years. That's compounding.
The Federal Reserve estimates a US $1 bill lasts about 6.6 years in circulation.
The book is drawn from Cash Empire Clicker, a free iPhone app. If you like the format, the app has more.
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