Using the "Rule of 72," about how long will it take a sum of money to double in value if the annual interest rate is 9 percent?

Principles of Accounting Volume 2
19th Edition
ISBN:9781947172609
Author:OpenStax
Publisher:OpenStax
Chapter11: Capital Budgeting Decisions
Section: Chapter Questions
Problem 9EA: If you invest $12,000 today, how much will you have in (for further Instructions on future value in...
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Which one is correct answer please confirm?

 

Q4: Using the "Rule of 72," about how long will it take a sum of money to double in value if the annual interest rate is 9 percent?
  a.
8 years
  b.
7 years
  c.
9 years
  d.
10 years
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