Answer :
Answer: b. 36 years under scenario A, versus 18 years under scenario B.
Explanation:
The Rule of 72 is a rule in finance that will allows for the calculation of how long it will take for an investment to double given its interest rate.
The time is calculated by dividing 72 by the interest rate in question.
Scenario A
= 72/2
= 36 years.
Scenario B
= 72/4
= 18 years.