Question 405608
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Hi
A= p(1+r) ^t 
A/p = 2 = (1.04)^t  |money doubling
2 = (1.04)^t 
ln2 = ln(1.04)^t    |taking logarithm of each side of the equation
ln2 = t*ln(1.04)
ln2/ln(1.04) = t
  17.673 yr = t, the time to double