To calculate the Rule of 72, you must divide the number 72 by the rate of return. Estimating doubling time with the Rule of 72 is simple. You can use the formula below to calculate the doubling ...

Letter Character:Learning the rules for adding suffixes can help you become better spellers. So here’s a quick recap of the ‘Rules for adding the suffixes–er, -ing, -ed, -est and –y.