SOLUTION: I have invested a sum of money into an account that gives 5.5% interest. I invested $250.00 more in my account that gives 7% interest. If the total interest at the end of the year

Question 671779: I have invested a sum of money into an account that gives 5.5% interest. I invested $250.00 more in my account that gives 7% interest. If the total interest at the end of the year is $800.00, how much did I invest altogether?

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
5.5% ------------ investment x
7%--------------- investment x+250
Total interest = 800
5.5%x+7%(x+250)=800
multiply by 100
5.5x+7(x+250)=800*100
5.5x+7x+1750=80000
12.5x=80000-1750
12.5x=78250
x=6260
$6260 @ 5.5%
$6510 @7%
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