<PRE><B>Question 983191</B>
.
x=amount at 6%; y=amount at 7%
.
x+y=$20000
x=$20000-y
.
0.06x+0.07y=$1280
0.06($20000-y)+0.07y=$1280
$1200-0.06y+0.07y=$1280
0.01y=$80
y=$8000 ANSWER 1: $8000 was invested at 7%.
.
x=$20000-y
x=$20000-$8000
x=$12000 ANSWER 2: $12000 was invested at 6%.
.
CHECK:
0.06x+0.07y=$1280
0.06($12000)+0.07($8000)=$1280
$720+$560=$1280
$1280=$1280












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