Use the formula
to find the doubling time t, in years, for an investment at r% compounded n times per year. Suppose you make an investment of $900 at interest rate 9% compounded quarterly. How long will it take for your investment to double? Round your answer to two decimal places.
?
A. 2.60 years
B. 15.58 years
C. 3.89 years
D. 4.02 years
E. 7.79 years
Answer: E
Mathematics
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at the point 
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A. 
B. 
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D. 
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