Question 807323: A total of $18,000 is invested in 3 accounts earning 4%, 5%, and 6% annual interest. The combined interest for one year is $888. If the amount invested at 6% is three times the amount at 5%, find the amount invested at 4%.
Enter the amount rounded to the nearest dollar, without commas or the dollar symbol.
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! A total of $18,000 is invested in 3 accounts earning 4%, 5%, and 6% annual interest. The combined interest for one year is $888. If the amount invested at 6% is three times the amount at 5%, find the amount invested at 4%.
Enter the amount rounded to the nearest dollar, without commas or the dollar symbol.
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let x = smt invested at 5%
2x = amt invested at 6%
18000-3x=amt invested st 4%d
.05x+.06*2x+.04(18000-3x)=888
.05x+.12x+720-.12x=888
.05x=888-720=168
x=3360
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