ARTICLE SYNOPSIS...Calculating Interest With the Rule of 72 by Raymond Rothschild Despite the convenience these days of computers, business calculators and the like, it is often desirable to perform some calculations either mentally or using pencil and paper. After all, o
ARTICLE SYNOPSIS...DERIVATION OF THE RULE OF 72 The mathematics behind the rule of 72, stating that if an amount is invested at a compound interest rate until it doubles in value, then the product of the number of years (or periods) and the interest rate is approximately