<PRE><B>Question 136254</B>
Colin invested $32,000, part at 8% and part at 12%.  If the total interest at the end of the year is $3,160, how much did he invest at each rate?

C1+C2=32000
C1(0.08)+C2(0.12)=3160

C1(0.08)+(32.000-C1)(0.12)=3160
-C1(0.04)+3840=3160
-C1(0.04)=-680
C1=17.000
C2=15.000
Answer: 17000 at 8% and 15000 at 12%</PRE>