Question 447273
8%----x
10%----7200-x
(you have equated the total interest to the total investment)
Interest same
0.08x=0.1(7200-x)
0.08x=720-0.1x
0.18x=820
x=720/0.18

$4000 @ 8%
Balance @10%

CHECK
0.08*4000=0.1*3200
320=320
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