Question 180634
First year
{{{N[1]=1000*(1+I)}}}
Second year 
{{{N[2]=N[1]*(1+I)}}}
{{{N[2]=1000*(1+I)^2=1500}}}
{{{(1+I)^2=1.5}}}
{{{(1+I)=sqrt(1.5)}}}
{{{I=sqrt(1.5)-1}}}
or approximately
{{{I=1.225-1=0.225}}}
You would need an interest rate of 22.5% to take $1000 to $1500 in two years.