<PRE><B>Question 598047</B>
$6000 is divided between two investments earning 7% and 9% simple interest.
 I want to earn a total annual of $500 interest.
 What is the smallest amount I can invest at 9% to earn the annual $500 interest?
:
Let x = amt invested at 9%
then
(6000-x) = amt invested at 7%
:
.07(6000-x) + .09x = 500
solve for x</PRE>