Sara has $2,500,000 and can earn 12.50 percent per year. If Sara plans on retiring when she has tripled her money, she can retire in how many years.

Question

Sara has $2,500,000 and can earn 12.50 percent per year.  If Sara plans on retiring when she has tripled her money, she can retire in how many years.

Reiny · Answer

If she has 2500,000 and she gets 12.5% per year in interest, she would earn $312,500 per year right now.
Heck!, she should retire right now

but according to your question
2.5 million(1.125)^n = 7.5 million
1.125)^n = 3
n log 1.123 = log3
n = appr 9.3 years