Posted by Robert on Thursday, April 28, 2011 at 8:27pm.
If she invested $X at 9%, then she invested $(X+200) at 6.5%.
Since the return is the same, then
X*0.09 = (X+200)*0.065
X(0.09-0.065)=200*0.065
0.025X = 13
X = 13/0.025 = $520 at 9%
X+200 = $720 at 6.5%
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