Total = Principal * (1 + rate)^years
Total = 500 * (1.015)^n
where n = number of years
If you need to know how long it will take to reach $800, you will have solve the equation for years
Years = {log(total) -log(Principal)} ÷ log(1 + rate)
Years = {log(800) -log(500)} ÷ log(1.015)
Years = 2.903089987 - 2.6989700043 / 0.0064660422492
Years = 0.2041199827 / 0.0064660422492
Years = 31.567993965
About 31 and a half years.
Here's a calculator to check the result
http://www.1728.org/compint.htm
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