Homework Help: Math

Posted by Joel on Wednesday, March 30, 2011 at 6:01pm.

melissa invested a some of money at 3% annual simple inter she invested 3 times that some at 5 % annual simple interest

if her total yearly interest from both investments was 7200 how much was invested at 3% ?

Math - Henry, Thursday, March 31, 2011 at 10:47pm
Invested $X @ 3%.
Invested $3X @ 5%.

0.03X + 0.05*3X = 7200.
0.03X + 0.15X = 7200,
0.18X = 7200.
X = $40,000.

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