<PRE><B>Question 1152879</B>
 6000 is invested, part of it at 20% and part of it at 4%.
 For a certain year, the total yield is $800.00.
 How much was invested at 20%? How much was invested at 4%?
:
Let a = amt invested at 20%
the total amt invested is $6000, therefore
(6000-a) = amt invested at 4%
:
.20a + .04(6000-a) = 800
.20a + 240 - .04a = 800
.20a - .04a = 800 - 240
.16a = 560
a = 560/.16
a = $3500 invested at 20%
and
6000 - 3500 = $2500 invested at 4%
:
:
Check this by finding the actual amt earned from each investment
.20(3500) = 700
.04(2500) = 100
----------------
earned total: 800</PRE>