Question 991354
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F=amount at 5.5%
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0.04($4000)+0.055(F)=0.045($4000+F)
$160+0.055F=$180+0.045F
0.010F=$20
F=$2000
ANSWER: He should invest $2000 at 5.5%.
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CHECK:
0.04($4000)+0.055($2000)=0.045($4000+$2000)
$160+$110=0.045($6000)
$270=$270