Using the rule of 72, calculate how long it would take a $2 000 investment to grow into $4 000 if the interest rate earned was 4 percent.
Select one:
o a. 6 years
o b. 12 years
O c. 24 years
o d. 18 years

Which account has the highest effective annual interest rate? not necessary but show how you got your answer.a. account 1: interest is compounded quarterly at an annual rate of 4.20%.b. account 2: interest is compounded monthly at an annual rate of 4.15%.c. account 3: interest is compounded semiannually at an annual rate of 4.10%d. account 4: interest is compounded annually at a rate of 4.25%.