Question: The time t (in years) for an investment to double is where r is the annual yield rate. How long does it take an investment

The time t (in years) for an investment to double is

In 2 In(1 + r)


where r is the annual yield rate. How long does it take an investment to double if r = 

(a) 3.00%, 

(b) 6.00%, 

(c) 9.00%?

In 2 In(1 + r)

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