<PRE><B>Question 1001244</B>
{{{A=Pe^rt}}} This is the formula for compound interest. In order to isolate r, I am going to rewrite it like this:
{{{e^rt*P=A}}} Divide both sides by P to simplify:
{{{e^rt=A/P}}} Now, to bring the exponents down, take the log of both sides:
{{{rt=log(A/P)+(2i)Pi*n}}} Divide both sides by t:
{{{r= ln(A/P)/t}}} Now go and apply this formula to your problem.
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Your problem (easiest solved by using fictitious numbers like I did):
r= log(1000/500)/10
r= log(2)/10
r= 0.301/10
r= 0.03%
All the best.
J</PRE>