Question 891612
{{{highlight_green(10000*1.04^t=20000)}}}, exponential growth, time t in years.


{{{1*1.04^t=2}}}
{{{1.04^t=2}}}
{{{log(10,(1.04^t))=log(10,2)}}}
{{{t*log(10,1.04)=log(10,2)}}}
{{{highlight(t=log(10,2)/log(10,1.04))}}}


You'll just need to evaluate that numeric expression.