What is the Rule 70

The rule of 70 is used to determine the number of hours/days/years it takes for a variable to double by dividing the number 70 by the variable’s growth rate. The rule of 70 is generally used to determine how long it would take for an investment to double given the annual rate of return. Problem: If a bacterial colony is 150 cells and the growth rate 2% an hour, how long will it take for a colony to reach 300 cells? If bacterial colony grow 7% an hour how long will it take for a colony to double in size? #rule70 #probability #statistics #growthRate #bacteriology