3 Answers

17.673 yr but I am the wrong person to ask...

12 years ago. Rating: 2
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4% of $25,000 is $100.  At that rate, it would take 25 years to double the investment.  This presumes you withdraw the interest.  If you reinvest the interest, it gets more complicated. 
$100 first year
$104 year 2 = $208
$108.32 year 3 = 316.32 
$112.65 year 4 = $428.97
$117.16 year 5 = $546.13
$121.85 year 6 = $667.98
$126.72 year 7 = $794.70
$131.79 year 8 = $926.49
$137.06 year 9 = $1063.55
$142.54 year 10 = $1206.09
$148.24 year 11 = $1354.33
$154.27 year 12 = $1508.60
$160.34 year 13 = $1668.94
$166.76 year 14 = $1835.70
$173.43 year 15 = $2009.13
$180.37 year 16 = $2189.50
$187.58 year 17 = $2377.08
$195.08 year 18 = $2572.16   That is $72.16 too much.  You earn $0.54189777 per day during year 18.  You need $122.92 to reach $2500 and realize double your investment.  It would take about 227 days to reach that amount, which is around August 15 (not counting this a leap year). That is a little more than 62% of the 18th year.  
All that just to pretty much agree with Ed1530!
Way to go ED1530! 

12 years ago. Rating: 1
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25 years @ 4%.

12 years ago. Rating: 1
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