Question 988842
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F=amount at 4%; T=amount at 10%
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F+T=$8100
T=$8100-F
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0.04F+0.10T=$504
0.04F+0.10($8100-F)=$504
0.04F+$810-0.10F=$504
-0.06F=-$306
F=$5100 ANSWER 1: $5100 was in the 4% account.
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T=$8100-F=$8100-$5100=$3000 ANSWER 2: $3000 was in the 10% account.
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CHECK:
0.04F+0.10T=$504
0.04($5100)+0.10($3000)=$504
$204+$300=$504
$504=$504