You can use the Rule of 72 to estimate the amount of time it will take for an investment to double.
It works by dividing 72 by the interest rate per period.
The rate here is 6% but this is an annual rate yet the interest is to be compounded quarterly. You need to convert this annual rate to a quarterly rate:
For example, a classroom of 30 students with 15 males and 15 females could generate a representative sample that might include six students: three males and three females
