Posted by Briana on Friday, September 7, 2012 at 4:57pm.
$X @ 12%.
$(7500-X) @ 10%
I = 0.12X + 0.1(7500-X) = $890.
0.12x + 750 - 0.1x = 890.
02x = 890 - 750 = 140
X = $7,000 @ 12%.
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